102657639 has 16 divisors (see below), whose sum is σ = 156621312. Its totient is φ = 58590048.

The previous prime is 102657631. The next prime is 102657649. The reversal of 102657639 is 936756201.

It is not a de Polignac number, because 102657639 - 2³ = 102657631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102657597 and 102657606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102657631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18157 + ... + 23129.

It is an arithmetic number, because the mean of its divisors is an integer number (9788832).

Almost surely, 2^102657639 is an apocalyptic number.

102657639 is a deficient number, since it is larger than the sum of its proper divisors (53963673).

102657639 is an equidigital number, since it uses as much as digits as its factorization.

102657639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5966.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 102657639 is about 10132.0106099431. The cubic root of 102657639 is about 468.2348746163.

The spelling of 102657639 in words is "one hundred two million, six hundred fifty-seven thousand, six hundred thirty-nine".