77407940 has 24 divisors (see below), whose sum is σ = 164236632. Its totient is φ = 30643200.

The previous prime is 77407937. The next prime is 77407951. The reversal of 77407940 is 4970477.

It can be written as a sum of positive squares in 4 ways, for example, as 3136 + 77404804 = 56^2 + 8798^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77407894 and 77407903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18011 + ... + 21890.

It is an arithmetic number, because the mean of its divisors is an integer number (6843193).

Almost surely, 2^77407940 is an apocalyptic number.

It is an amenable number.

77407940 is an abundant number, since it is smaller than the sum of its proper divisors (86828692).

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

77407940 is a wasteful number, since it uses less digits than its factorization.

77407940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40007 (or 40005 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 77407940 is about 8798.1782205182. The cubic root of 77407940 is about 426.1820656376.

The spelling of 77407940 in words is "seventy-seven million, four hundred seven thousand, nine hundred forty".