78572890 has 32 divisors (see below), whose sum is σ = 159615360. Its totient is φ = 27585600.

The previous prime is 78572887. The next prime is 78572891. The reversal of 78572890 is 9827587.

It is a self number, because there is not a number n which added to its sum of digits gives 78572890.

It is not an unprimeable number, because it can be changed into a prime (78572891) 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, 9126 + ... + 15505.

It is an arithmetic number, because the mean of its divisors is an integer number (4987980).

Almost surely, 2^78572890 is an apocalyptic number.

78572890 is an abundant number, since it is smaller than the sum of its proper divisors (81042470).

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

78572890 is a wasteful number, since it uses less digits than its factorization.

78572890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24678.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 78572890 is about 8864.1350395851. The cubic root of 78572890 is about 428.3093703212.

The spelling of 78572890 in words is "seventy-eight million, five hundred seventy-two thousand, eight hundred ninety".