77878842 has 16 divisors (see below), whose sum is σ = 155865792. Its totient is φ = 25941600.

The previous prime is 77878831. The next prime is 77878877. The reversal of 77878842 is 24887877.

It is a super-2 number, since 2×77878842² = 12130228062521928, which contains 22 as substring.

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, 7203 + ... + 14409.

It is an arithmetic number, because the mean of its divisors is an integer number (9741612).

Almost surely, 2^77878842 is an apocalyptic number.

77878842 is an abundant number, since it is smaller than the sum of its proper divisors (77986950).

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

77878842 is a wasteful number, since it uses less digits than its factorization.

77878842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013.

The product of its digits is 1404928, while the sum is 51.

The square root of 77878842 is about 8824.8989795918. The cubic root of 77878842 is about 427.0445284074.

The spelling of 77878842 in words is "seventy-seven million, eight hundred seventy-eight thousand, eight hundred forty-two".