78811528 has 8 divisors (see below), whose sum is σ = 147771630. Its totient is φ = 39405760.

The previous prime is 78811519. The next prime is 78811597. The reversal of 78811528 is 82511887.

It can be written as a sum of positive squares in only one way, i.e., 69189124 + 9622404 = 8318^2 + 3102^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78811528² = 12422513891389568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4925713 + ... + 4925728.

Almost surely, 2^78811528 is an apocalyptic number.

It is an amenable number.

78811528 is a deficient number, since it is larger than the sum of its proper divisors (68960102).

78811528 is a wasteful number, since it uses less digits than its factorization.

78811528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9851447 (or 9851443 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 78811528 is about 8877.5857078375. The cubic root of 78811528 is about 428.7425459751.

It can be divided in two parts, 7881 and 1528, that added together give a square (9409 = 97²).

The spelling of 78811528 in words is "seventy-eight million, eight hundred eleven thousand, five hundred twenty-eight".