102640508340 has 72 divisors (see below), whose sum is σ = 296963402400. Its totient is φ = 26487858240.

The previous prime is 102640508281. The next prime is 102640508363. The reversal of 102640508340 is 43805046201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 832390 + ... + 947709.

It is an arithmetic number, because the mean of its divisors is an integer number (4124491700).

Almost surely, 2^102640508340 is an apocalyptic number.

102640508340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102640508340 is an abundant number, since it is smaller than the sum of its proper divisors (194322894060).

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

102640508340 is a wasteful number, since it uses less digits than its factorization.

102640508340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780173 (or 1780140 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 102640508340 in words is "one hundred two billion, six hundred forty million, five hundred eight thousand, three hundred forty".