78561198 has 32 divisors (see below), whose sum is σ = 175370400. Its totient is φ = 26068608.

The previous prime is 78561193. The next prime is 78561227. The reversal of 78561198 is 89116587.

78561198 is a `hidden beast` number, since 78 + 561 + 19 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78561193) 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, 9190 + ... + 15542.

It is an arithmetic number, because the mean of its divisors is an integer number (5480325).

Almost surely, 2^78561198 is an apocalyptic number.

78561198 is an abundant number, since it is smaller than the sum of its proper divisors (96809202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78561198 is a wasteful number, since it uses less digits than its factorization.

78561198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593 (or 6587 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 78561198 is about 8863.4755034354. The cubic root of 78561198 is about 428.2881244794.

The spelling of 78561198 in words is "seventy-eight million, five hundred sixty-one thousand, one hundred ninety-eight".