102644440978 has 8 divisors (see below), whose sum is σ = 159275856780. Its totient is φ = 49552488720.

The previous prime is 102644440939. The next prime is 102644440999. The reversal of 102644440978 is 879044446201.

It can be written as a sum of positive squares in 2 ways, for example, as 101450531169 + 1193909809 = 318513^2 + 34553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×102644440978² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884865813 + ... + 884865928.

Almost surely, 2^102644440978 is an apocalyptic number.

102644440978 is a deficient number, since it is larger than the sum of its proper divisors (56631415802).

102644440978 is a wasteful number, since it uses less digits than its factorization.

102644440978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769731772.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 102644440978 in words is "one hundred two billion, six hundred forty-four million, four hundred forty thousand, nine hundred seventy-eight".