78738530 has 32 divisors (see below), whose sum is σ = 154741104. Its totient is φ = 28670976.

The previous prime is 78738523. The next prime is 78738551. The reversal of 78738530 is 3583787.

It can be written as a sum of positive squares in 8 ways, for example, as 48455521 + 30283009 = 6961^2 + 5503^2 .

It is a super-2 number, since 2×78738530² = 12399512213121800, which contains 22 as substring.

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, 5342 + ... + 13638.

Almost surely, 2^78738530 is an apocalyptic number.

78738530 is a deficient number, since it is larger than the sum of its proper divisors (76002574).

78738530 is a wasteful number, since it uses less digits than its factorization.

78738530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8390.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 78738530 is about 8873.4733898288. The cubic root of 78738530 is about 428.6101329595.

The spelling of 78738530 in words is "seventy-eight million, seven hundred thirty-eight thousand, five hundred thirty".