1651643040 has 96 divisors (see below), whose sum is σ = 5209275456. Its totient is φ = 439879680.

The previous prime is 1651643009. The next prime is 1651643047. The reversal of 1651643040 is 403461561.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1651642989 and 1651643007.

It is not an unprimeable number, because it can be changed into a prime (1651643047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494175 + ... + 497505.

It is an arithmetic number, because the mean of its divisors is an integer number (54263286).

Almost surely, 2^1651643040 is an apocalyptic number.

1651643040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651643040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604637728).

1651643040 is an abundant number, since it is smaller than the sum of its proper divisors (3557632416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1651643040 is a wasteful number, since it uses less digits than its factorization.

1651643040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382 (or 4374 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1651643040 is about 40640.4114152404. The cubic root of 1651643040 is about 1182.0578474384.

The spelling of 1651643040 in words is "one billion, six hundred fifty-one million, six hundred forty-three thousand, forty".