1640017640 has 32 divisors (see below), whose sum is σ = 3742018560. Its totient is φ = 646766400.

The previous prime is 1640017601. The next prime is 1640017669. The reversal of 1640017640 is 467100461.

It is a super-2 number, since 2×1640017640² = 5379315719022339200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285896 + ... + 291575.

It is an arithmetic number, because the mean of its divisors is an integer number (116938080).

Almost surely, 2^1640017640 is an apocalyptic number.

1640017640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640017640 is an abundant number, since it is smaller than the sum of its proper divisors (2102000920).

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

1640017640 is a wasteful number, since it uses less digits than its factorization.

1640017640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577553 (or 577549 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1640017640 is about 40497.1312564236. The cubic root of 1640017640 is about 1179.2779361066.

The spelling of 1640017640 in words is "one billion, six hundred forty million, seventeen thousand, six hundred forty".