102779975 has 6 divisors (see below), whose sum is σ = 127447200. Its totient is φ = 82223960.

The previous prime is 102779951. The next prime is 102780037. The reversal of 102779975 is 579977201.

It is a de Polignac number, because none of the positive numbers 2^k-102779975 is a prime.

It is a super-2 number, since 2×102779975² = 21127446522001250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2055575 + ... + 2055624.

It is an arithmetic number, because the mean of its divisors is an integer number (21241200).

Almost surely, 2^102779975 is an apocalyptic number.

102779975 is a deficient number, since it is larger than the sum of its proper divisors (24667225).

102779975 is an equidigital number, since it uses as much as digits as its factorization.

102779975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111209 (or 4111204 counting only the distinct ones).

The product of its (nonzero) digits is 277830, while the sum is 47.

The square root of 102779975 is about 10138.0459162503. The cubic root of 102779975 is about 468.4207975965.

The spelling of 102779975 in words is "one hundred two million, seven hundred seventy-nine thousand, nine hundred seventy-five".