653640878 has 32 divisors (see below), whose sum is σ = 1091553408. Its totient is φ = 291060000.

The previous prime is 653640863. The next prime is 653640899. The reversal of 653640878 is 878046356.

It is a super-2 number, since 2×653640878² = 854492794785221768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289253 + ... + 291503.

It is an arithmetic number, because the mean of its divisors is an integer number (34111044).

Almost surely, 2^653640878 is an apocalyptic number.

653640878 is a deficient number, since it is larger than the sum of its proper divisors (437912530).

653640878 is a wasteful number, since it uses less digits than its factorization.

653640878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 653640878 is about 25566.4013502096. The cubic root of 653640878 is about 867.8534645779.

The spelling of 653640878 in words is "six hundred fifty-three million, six hundred forty thousand, eight hundred seventy-eight".