78136761 has 8 divisors (see below), whose sum is σ = 104238880. Its totient is φ = 52062912.

The previous prime is 78136757. The next prime is 78136769. The reversal of 78136761 is 16763187.

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

It is not a de Polignac number, because 78136761 - 2² = 78136757 is a prime.

It is a super-2 number, since 2×78136761² = 12210706839142242, which contains 22 as substring.

It is the 8840-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78136769) by changing a digit.

It is a nontrivial repunit in base 8839.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (13029860).

Almost surely, 2^78136761 is an apocalyptic number.

It is an amenable number.

78136761 is a deficient number, since it is larger than the sum of its proper divisors (26102119).

78136761 is a wasteful number, since it uses less digits than its factorization.

78136761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14135.

The product of its digits is 42336, while the sum is 39.

The square root of 78136761 is about 8839.5000424232. The cubic root of 78136761 is about 427.5154373551.

The spelling of 78136761 in words is "seventy-eight million, one hundred thirty-six thousand, seven hundred sixty-one".