102978657 has 6 divisors (see below), whose sum is σ = 148746962. Its totient is φ = 68652432.

The previous prime is 102978643. The next prime is 102978661. The reversal of 102978657 is 756879201.

It can be written as a sum of positive squares in only one way, i.e., 57699216 + 45279441 = 7596^2 + 6729^2 .

It is not a de Polignac number, because 102978657 - 2¹⁵ = 102945889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102978677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5721028 + ... + 5721045.

Almost surely, 2^102978657 is an apocalyptic number.

It is an amenable number.

102978657 is a deficient number, since it is larger than the sum of its proper divisors (45768305).

102978657 is a wasteful number, since it uses less digits than its factorization.

102978657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11442079 (or 11442076 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 102978657 is about 10147.8400164764. The cubic root of 102978657 is about 468.7224350724.

The spelling of 102978657 in words is "one hundred two million, nine hundred seventy-eight thousand, six hundred fifty-seven".