78938290 has 16 divisors (see below), whose sum is σ = 146989080. Its totient is φ = 30486400.

The previous prime is 78938221. The next prime is 78938311. The reversal of 78938290 is 9283987.

It can be written as a sum of positive squares in 4 ways, for example, as 69739201 + 9199089 = 8351^2 + 3033^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78938290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135811 + ... + 136390.

Almost surely, 2^78938290 is an apocalyptic number.

78938290 is a deficient number, since it is larger than the sum of its proper divisors (68050790).

78938290 is a wasteful number, since it uses less digits than its factorization.

78938290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272237.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 78938290 is about 8884.7222804092. The cubic root of 78938290 is about 428.9722888047.

The spelling of 78938290 in words is "seventy-eight million, nine hundred thirty-eight thousand, two hundred ninety".