78131090 has 8 divisors (see below), whose sum is σ = 140635980. Its totient is φ = 31252432.

The previous prime is 78131083. The next prime is 78131107. The reversal of 78131090 is 9013187.

It can be written as a sum of positive squares in 2 ways, for example, as 62552281 + 15578809 = 7909^2 + 3947^2 .

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

It is a super-2 number, since 2×78131090² = 12208934449176200, which contains 22 as substring.

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, 3906545 + ... + 3906564.

Almost surely, 2^78131090 is an apocalyptic number.

78131090 is a deficient number, since it is larger than the sum of its proper divisors (62504890).

78131090 is a wasteful number, since it uses less digits than its factorization.

78131090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7813116.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 78131090 is about 8839.1792605422. The cubic root of 78131090 is about 427.5050943843.

The spelling of 78131090 in words is "seventy-eight million, one hundred thirty-one thousand, ninety".