77039677778 has 24 divisors (see below), whose sum is σ = 136962732492. Its totient is φ = 32394040224.

The previous prime is 77039677763. The next prime is 77039677837. The reversal of 77039677778 is 87777693077.

It can be written as a sum of positive squares in 2 ways, for example, as 76835959249 + 203718529 = 277193^2 + 14273^2 .

It is a super-2 number, since 2×77039677778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7411025 + ... + 7421412.

Almost surely, 2^77039677778 is an apocalyptic number.

77039677778 is a deficient number, since it is larger than the sum of its proper divisors (59923054714).

77039677778 is a wasteful number, since it uses less digits than its factorization.

77039677778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14832506 (or 14832499 counting only the distinct ones).

The product of its (nonzero) digits is 152473104, while the sum is 68.

The spelling of 77039677778 in words is "seventy-seven billion, thirty-nine million, six hundred seventy-seven thousand, seven hundred seventy-eight".