1651645240 has 32 divisors (see below), whose sum is σ = 4247088480. Its totient is φ = 566278272.

The previous prime is 1651645231. The next prime is 1651645241. The reversal of 1651645240 is 425461561.

It is a junction number, because it is equal to n+sod(n) for n = 1651645196 and 1651645205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651645241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2949087 + ... + 2949646.

It is an arithmetic number, because the mean of its divisors is an integer number (132721515).

Almost surely, 2^1651645240 is an apocalyptic number.

1651645240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1651645240 is an abundant number, since it is smaller than the sum of its proper divisors (2595443240).

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

1651645240 is a wasteful number, since it uses less digits than its factorization.

1651645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898751 (or 5898747 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1651645240 is about 40640.4384818865. The cubic root of 1651645240 is about 1182.0583722746.

The spelling of 1651645240 in words is "one billion, six hundred fifty-one million, six hundred forty-five thousand, two hundred forty".