78367761 has 24 divisors (see below), whose sum is σ = 121417920. Its totient is φ = 48555936.

The previous prime is 78367733. The next prime is 78367777. The reversal of 78367761 is 16776387.

It is a happy number.

It is not a de Polignac number, because 78367761 - 2⁶ = 78367697 is a prime.

It is a super-2 number, since 2×78367761² = 12283011928306242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78367711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4740 + ... + 13386.

It is an arithmetic number, because the mean of its divisors is an integer number (5059080).

Almost surely, 2^78367761 is an apocalyptic number.

It is an amenable number.

78367761 is a deficient number, since it is larger than the sum of its proper divisors (43050159).

78367761 is a wasteful number, since it uses less digits than its factorization.

78367761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8725 (or 8722 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 78367761 is about 8852.5567493239. The cubic root of 78367761 is about 427.9363186618.

The spelling of 78367761 in words is "seventy-eight million, three hundred sixty-seven thousand, seven hundred sixty-one".