1640146872 has 64 divisors (see below), whose sum is σ = 5046612480. Its totient is φ = 432565632.

The previous prime is 1640146843. The next prime is 1640146883. The reversal of 1640146872 is 2786410461.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1640146872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373308 + ... + 377675.

It is an arithmetic number, because the mean of its divisors is an integer number (78853320).

Almost surely, 2^1640146872 is an apocalyptic number.

1640146872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640146872 is an abundant number, since it is smaller than the sum of its proper divisors (3406465608).

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

1640146872 is a wasteful number, since it uses less digits than its factorization.

1640146872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751012 (or 751008 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1640146872 is about 40498.7267948018. The cubic root of 1640146872 is about 1179.3089106603.

The spelling of 1640146872 in words is "one billion, six hundred forty million, one hundred forty-six thousand, eight hundred seventy-two".