78131330 has 8 divisors (see below), whose sum is σ = 140636412. Its totient is φ = 31252528.

The previous prime is 78131323. The next prime is 78131353. The reversal of 78131330 is 3313187.

It can be written as a sum of positive squares in 2 ways, for example, as 68773849 + 9357481 = 8293^2 + 3059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78131330² = 12209009455137800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78131330.

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, 3906557 + ... + 3906576.

Almost surely, 2^78131330 is an apocalyptic number.

78131330 is a deficient number, since it is larger than the sum of its proper divisors (62505082).

78131330 is a wasteful number, since it uses less digits than its factorization.

78131330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7813140.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 78131330 is about 8839.1928364529. The cubic root of 78131330 is about 427.5055321150.

The spelling of 78131330 in words is "seventy-eight million, one hundred thirty-one thousand, three hundred thirty".