78879531025 has 9 divisors (see below), whose sum is σ = 97812359803. Its totient is φ = 63102501400.

The previous prime is 78879531023. The next prime is 78879531037. The reversal of 78879531025 is 52013597887.

The square root of 78879531025 is 280855.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 28396631169 + 50482899856 = 168513^2 + 224684^2 .

It is not a de Polignac number, because 78879531025 - 2¹ = 78879531023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78879531023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1376190 + ... + 1432360.

Almost surely, 2^78879531025 is an apocalyptic number.

78879531025 is the 280855-th square number.

78879531025 is the 140428-th centered octagonal number.

It is an amenable number.

78879531025 is a deficient number, since it is larger than the sum of its proper divisors (18932828778).

78879531025 is an frugal number, since it uses more digits than its factorization.

78879531025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112352 (or 56176 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 78879531025 in words is "seventy-eight billion, eight hundred seventy-nine million, five hundred thirty-one thousand, twenty-five".