77849140 has 12 divisors (see below), whose sum is σ = 163483236. Its totient is φ = 31139648.

The previous prime is 77849131. The next prime is 77849159. The reversal of 77849140 is 4194877.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 44809636 = 5748^2 + 6694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77849093 and 77849102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946209 + ... + 1946248.

It is an arithmetic number, because the mean of its divisors is an integer number (13623603).

Almost surely, 2^77849140 is an apocalyptic number.

It is an amenable number.

77849140 is an abundant number, since it is smaller than the sum of its proper divisors (85634096).

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

77849140 is a wasteful number, since it uses less digits than its factorization.

77849140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892466 (or 3892464 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 77849140 is about 8823.2159669817. The cubic root of 77849140 is about 426.9902317199.

The spelling of 77849140 in words is "seventy-seven million, eight hundred forty-nine thousand, one hundred forty".