653805640 has 32 divisors (see below), whose sum is σ = 1473151680. Its totient is φ = 261150912.

The previous prime is 653805629. The next prime is 653805641. The reversal of 653805640 is 46508356.

It is a self number, because there is not a number n which added to its sum of digits gives 653805640.

It is not an unprimeable number, because it can be changed into a prime (653805641) 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, 17839 + ... + 40321.

It is an arithmetic number, because the mean of its divisors is an integer number (46035990).

Almost surely, 2^653805640 is an apocalyptic number.

It is an amenable number.

653805640 is an abundant number, since it is smaller than the sum of its proper divisors (819346040).

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

653805640 is a wasteful number, since it uses less digits than its factorization.

653805640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23221 (or 23217 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 653805640 is about 25569.6233840078. The cubic root of 653805640 is about 867.9263778369.

The spelling of 653805640 in words is "six hundred fifty-three million, eight hundred five thousand, six hundred forty".