878777640 has 128 divisors (see below), whose sum is σ = 3154636800. Its totient is φ = 216311040.

The previous prime is 878777623. The next prime is 878777657. The reversal of 878777640 is 46777878.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (878777623) and next prime (878777657).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17256 + ... + 45335.

It is an arithmetic number, because the mean of its divisors is an integer number (24645600).

Almost surely, 2^878777640 is an apocalyptic number.

It is an amenable number.

878777640 is an abundant number, since it is smaller than the sum of its proper divisors (2275859160).

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

878777640 is a wasteful number, since it uses less digits than its factorization.

878777640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62624 (or 62614 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 54.

The square root of 878777640 is about 29644.1839152303. The cubic root of 878777640 is about 957.8400658158.

The spelling of 878777640 in words is "eight hundred seventy-eight million, seven hundred seventy-seven thousand, six hundred forty".