1649518920 has 96 divisors (see below), whose sum is σ = 6126793920. Its totient is φ = 377032320.

The previous prime is 1649518907. The next prime is 1649518921. The reversal of 1649518920 is 298159461.

1649518920 is a `hidden beast` number, since 1 + 6 + 49 + 518 + 92 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1649518921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324766 + ... + 329805.

It is an arithmetic number, because the mean of its divisors is an integer number (63820770).

Almost surely, 2^1649518920 is an apocalyptic number.

1649518920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649518920 is an abundant number, since it is smaller than the sum of its proper divisors (4477275000).

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

1649518920 is a wasteful number, since it uses less digits than its factorization.

1649518920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654595 (or 654588 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1649518920 is about 40614.2699060318. The cubic root of 1649518920 is about 1181.5508957166.

The spelling of 1649518920 in words is "one billion, six hundred forty-nine million, five hundred eighteen thousand, nine hundred twenty".