102779457 has 12 divisors (see below), whose sum is σ = 150630480. Its totient is φ = 62290360.

The previous prime is 102779447. The next prime is 102779483. The reversal of 102779457 is 754977201.

It is a de Polignac number, because none of the positive numbers 2^k-102779457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102779447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141207 + ... + 141932.

It is an arithmetic number, because the mean of its divisors is an integer number (12552540).

Almost surely, 2^102779457 is an apocalyptic number.

It is an amenable number.

102779457 is a deficient number, since it is larger than the sum of its proper divisors (47851023).

102779457 is a wasteful number, since it uses less digits than its factorization.

102779457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283164 (or 283153 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 42.

The square root of 102779457 is about 10138.0203688886. The cubic root of 102779457 is about 468.4200106651.

The spelling of 102779457 in words is "one hundred two million, seven hundred seventy-nine thousand, four hundred fifty-seven".