78128552 has 16 divisors (see below), whose sum is σ = 151542900. Its totient is φ = 37717120.

The previous prime is 78128543. The next prime is 78128563. The reversal of 78128552 is 25582187.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67798756 + 10329796 = 8234^2 + 3214^2 .

It is a super-2 number, since 2×78128552² = 12208141275233408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168149 + ... + 168612.

Almost surely, 2^78128552 is an apocalyptic number.

It is an amenable number.

78128552 is a deficient number, since it is larger than the sum of its proper divisors (73414348).

78128552 is a wasteful number, since it uses less digits than its factorization.

78128552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336796 (or 336792 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 78128552 is about 8839.0356940110. The cubic root of 78128552 is about 427.5004653279.

The spelling of 78128552 in words is "seventy-eight million, one hundred twenty-eight thousand, five hundred fifty-two".