78660425 has 12 divisors (see below), whose sum is σ = 98637660. Its totient is φ = 62219520.

The previous prime is 78660419. The next prime is 78660443. The reversal of 78660425 is 52406687.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 373321 + 78287104 = 611^2 + 8848^2 .

It is not a de Polignac number, because 78660425 - 2¹⁰ = 78659401 is a prime.

It is a super-2 number, since 2×78660425² = 12374924922361250, which contains 22 as substring.

It is a congruent number.

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, 15452 + ... + 19901.

It is an arithmetic number, because the mean of its divisors is an integer number (8219805).

Almost surely, 2^78660425 is an apocalyptic number.

It is an amenable number.

78660425 is a deficient number, since it is larger than the sum of its proper divisors (19977235).

78660425 is a wasteful number, since it uses less digits than its factorization.

78660425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35452 (or 35447 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 78660425 is about 8869.0712591567. The cubic root of 78660425 is about 428.4683655613.

The spelling of 78660425 in words is "seventy-eight million, six hundred sixty thousand, four hundred twenty-five".