102640310408 has 8 divisors (see below), whose sum is σ = 192450582030. Its totient is φ = 51320155200.

The previous prime is 102640310407. The next prime is 102640310441. The reversal of 102640310408 is 804013046201.

It can be written as a sum of positive squares in only one way, i.e., 93796412644 + 8843897764 = 306262^2 + 94042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (102640310407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6415019393 + ... + 6415019408.

Almost surely, 2^102640310408 is an apocalyptic number.

It is an amenable number.

102640310408 is a deficient number, since it is larger than the sum of its proper divisors (89810271622).

102640310408 is a wasteful number, since it uses less digits than its factorization.

102640310408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830038807 (or 12830038803 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 102640310408 its reverse (804013046201), we get a palindrome (906653356609).

The spelling of 102640310408 in words is "one hundred two billion, six hundred forty million, three hundred ten thousand, four hundred eight".