647365878 has 32 divisors (see below), whose sum is σ = 1445068800. Its totient is φ = 214816968.

The previous prime is 647365871. The next prime is 647365883. The reversal of 647365878 is 878563746.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647365871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14838 + ... + 38921.

It is an arithmetic number, because the mean of its divisors is an integer number (45158400).

Almost surely, 2^647365878 is an apocalyptic number.

647365878 is an abundant number, since it is smaller than the sum of its proper divisors (797702922).

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

647365878 is a wasteful number, since it uses less digits than its factorization.

647365878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53993 (or 53987 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 647365878 is about 25443.3857416815. The cubic root of 647365878 is about 865.0673777803.

The spelling of 647365878 in words is "six hundred forty-seven million, three hundred sixty-five thousand, eight hundred seventy-eight".