102581978 has 32 divisors (see below), whose sum is σ = 171040896. Its totient is φ = 45895168.

The previous prime is 102581951. The next prime is 102581989. The reversal of 102581978 is 879185201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181925 + ... + 182487.

It is an arithmetic number, because the mean of its divisors is an integer number (5345028).

Almost surely, 2^102581978 is an apocalyptic number.

102581978 is a deficient number, since it is larger than the sum of its proper divisors (68458918).

102581978 is a wasteful number, since it uses less digits than its factorization.

102581978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 102581978 is about 10128.2761613218. The cubic root of 102581978 is about 468.1198131158.

The spelling of 102581978 in words is "one hundred two million, five hundred eighty-one thousand, nine hundred seventy-eight".