653978344 has 16 divisors (see below), whose sum is σ = 1230398820. Its totient is φ = 325872000.

The previous prime is 653978341. The next prime is 653978383. The reversal of 653978344 is 443879356.

It can be written as a sum of positive squares in 2 ways, for example, as 653415844 + 562500 = 25562^2 + 750^2 .

It is not an unprimeable number, because it can be changed into a prime (653978341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137157 + ... + 141844.

Almost surely, 2^653978344 is an apocalyptic number.

It is an amenable number.

653978344 is a deficient number, since it is larger than the sum of its proper divisors (576420476).

653978344 is a wasteful number, since it uses less digits than its factorization.

653978344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279300 (or 279296 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 49.

The square root of 653978344 is about 25573.0002932781. Note that the first 3 decimals coincide. The cubic root of 653978344 is about 868.0027925753.

The spelling of 653978344 in words is "six hundred fifty-three million, nine hundred seventy-eight thousand, three hundred forty-four".