640435634572740 has 48 divisors (see below), whose sum is σ = 1855054941526080. Its totient is φ = 164893772579200.

The previous prime is 640435634572733. The next prime is 640435634572793. The reversal of 640435634572740 is 47275436534046.

It is a super-2 number, since 2×640435634572740² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 184033226586 + ... + 184033230065.

It is an arithmetic number, because the mean of its divisors is an integer number (38646977948460).

Almost surely, 2^{640435634572740} is an apocalyptic number.

640435634572740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640435634572740 is an abundant number, since it is smaller than the sum of its proper divisors (1214619306953340).

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

640435634572740 is a wasteful number, since it uses less digits than its factorization.

640435634572740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368066456692 (or 368066456690 counting only the distinct ones).

The product of its (nonzero) digits is 203212800, while the sum is 60.

The spelling of 640435634572740 in words is "six hundred forty trillion, four hundred thirty-five billion, six hundred thirty-four million, five hundred seventy-two thousand, seven hundred forty".