78877640 has 32 divisors (see below), whose sum is σ = 183202560. Its totient is φ = 30532800.

The previous prime is 78877633. The next prime is 78877657. The reversal of 78877640 is 4677887.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30566 + ... + 33045.

It is an arithmetic number, because the mean of its divisors is an integer number (5725080).

Almost surely, 2^78877640 is an apocalyptic number.

It is an amenable number.

78877640 is an abundant number, since it is smaller than the sum of its proper divisors (104324920).

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

78877640 is a wasteful number, since it uses less digits than its factorization.

78877640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63653 (or 63649 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 78877640 is about 8881.3084621580. The cubic root of 78877640 is about 428.8623977521.

The spelling of 78877640 in words is "seventy-eight million, eight hundred seventy-seven thousand, six hundred forty".