78211025 has 12 divisors (see below), whose sum is σ = 97231500. Its totient is φ = 62407680.

The previous prime is 78211019. The next prime is 78211031. The reversal of 78211025 is 52011287.

It is an interprime number because it is at equal distance from previous prime (78211019) and next prime (78211031).

It can be written as a sum of positive squares in 6 ways, for example, as 2660161 + 75550864 = 1631^2 + 8692^2 .

It is not a de Polignac number, because 78211025 - 2¹⁸ = 77948881 is a prime.

It is a super-2 number, since 2×78211025² = 12233928863101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78210985 and 78211003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6401 + ... + 14049.

It is an arithmetic number, because the mean of its divisors is an integer number (8102625).

Almost surely, 2^78211025 is an apocalyptic number.

It is an amenable number.

78211025 is a deficient number, since it is larger than the sum of its proper divisors (19020475).

78211025 is a wasteful number, since it uses less digits than its factorization.

78211025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8068 (or 8063 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 78211025 is about 8843.6997348395. The cubic root of 78211025 is about 427.6508365060.

The spelling of 78211025 in words is "seventy-eight million, two hundred eleven thousand, twenty-five".