77776040 has 16 divisors (see below), whose sum is σ = 174996180. Its totient is φ = 31110400.

The previous prime is 77776031. The next prime is 77776043. The reversal of 77776040 is 4067777.

It can be written as a sum of positive squares in 2 ways, for example, as 76282756 + 1493284 = 8734^2 + 1222^2 .

It is a super-2 number, since 2×77776040² = 12098224796163200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77775985 and 77776003.

It is not an unprimeable number, because it can be changed into a prime (77776043) 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, 972161 + ... + 972240.

Almost surely, 2^77776040 is an apocalyptic number.

It is an amenable number.

77776040 is an abundant number, since it is smaller than the sum of its proper divisors (97220140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77776040 is a wasteful number, since it uses less digits than its factorization.

77776040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944412 (or 1944408 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 38.

The square root of 77776040 is about 8819.0725135923. The cubic root of 77776040 is about 426.8565425502.

The spelling of 77776040 in words is "seventy-seven million, seven hundred seventy-six thousand, forty".