1640140810 has 128 divisors (see below), whose sum is σ = 3946143744. Its totient is φ = 475580160.

The previous prime is 1640140783. The next prime is 1640140837. The reversal of 1640140810 is 180410461.

It is an interprime number because it is at equal distance from previous prime (1640140783) and next prime (1640140837).

It is a super-2 number, since 2×1640140810² = 5380123753254912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 654019 + ... + 656521.

It is an arithmetic number, because the mean of its divisors is an integer number (30829248).

Almost surely, 2^1640140810 is an apocalyptic number.

1640140810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640140810 is an abundant number, since it is smaller than the sum of its proper divisors (2306002934).

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

1640140810 is a wasteful number, since it uses less digits than its factorization.

1640140810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 1640140810 is about 40498.6519528737. The cubic root of 1640140810 is about 1179.3074577458.

The spelling of 1640140810 in words is "one billion, six hundred forty million, one hundred forty thousand, eight hundred ten".