77879140 has 12 divisors (see below), whose sum is σ = 163546236. Its totient is φ = 31151648.

The previous prime is 77879129. The next prime is 77879143. The reversal of 77879140 is 4197877.

It can be written as a sum of positive squares in 2 ways, for example, as 43586404 + 34292736 = 6602^2 + 5856^2 .

It is not an unprimeable number, because it can be changed into a prime (77879143) 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, 1946959 + ... + 1946998.

It is an arithmetic number, because the mean of its divisors is an integer number (13628853).

Almost surely, 2^77879140 is an apocalyptic number.

It is an amenable number.

77879140 is an abundant number, since it is smaller than the sum of its proper divisors (85667096).

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

77879140 is a wasteful number, since it uses less digits than its factorization.

77879140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893966 (or 3893964 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 77879140 is about 8824.9158636216. The cubic root of 77879140 is about 427.0450730958.

The spelling of 77879140 in words is "seventy-seven million, eight hundred seventy-nine thousand, one hundred forty".