78136077 has 4 divisors (see below), whose sum is σ = 104181440. Its totient is φ = 52090716.

The previous prime is 78136073. The next prime is 78136087. The reversal of 78136077 is 77063187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78136077 - 2² = 78136073 is a prime.

It is a super-2 number, since 2×78136077² = 12210493057899858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78136073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13022677 + ... + 13022682.

It is an arithmetic number, because the mean of its divisors is an integer number (26045360).

Almost surely, 2^78136077 is an apocalyptic number.

It is an amenable number.

78136077 is a deficient number, since it is larger than the sum of its proper divisors (26045363).

78136077 is a wasteful number, since it uses less digits than its factorization.

78136077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26045362.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 78136077 is about 8839.4613523676. The cubic root of 78136077 is about 427.5141898782.

The spelling of 78136077 in words is "seventy-eight million, one hundred thirty-six thousand, seventy-seven".