77840670 has 16 divisors (see below), whose sum is σ = 186817680. Its totient is φ = 20757504.

The previous prime is 77840639. The next prime is 77840677. The reversal of 77840670 is 7604877.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77840677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1297315 + ... + 1297374.

It is an arithmetic number, because the mean of its divisors is an integer number (11676105).

Almost surely, 2^77840670 is an apocalyptic number.

77840670 is an abundant number, since it is smaller than the sum of its proper divisors (108977010).

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

77840670 is a wasteful number, since it uses less digits than its factorization.

77840670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594699.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 77840670 is about 8822.7359702079. The cubic root of 77840670 is about 426.9747456210.

The spelling of 77840670 in words is "seventy-seven million, eight hundred forty thousand, six hundred seventy".