656999442 has 96 divisors (see below), whose sum is σ = 1730963520. Its totient is φ = 177500160.

The previous prime is 656999419. The next prime is 656999443. The reversal of 656999442 is 244999656.

It is a happy number.

It is a super-2 number, since 2×656999442² = 863296533576622728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656999443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58818 + ... + 69090.

It is an arithmetic number, because the mean of its divisors is an integer number (18030870).

Almost surely, 2^656999442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656999442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865481760).

656999442 is an abundant number, since it is smaller than the sum of its proper divisors (1073964078).

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

656999442 is a wasteful number, since it uses less digits than its factorization.

656999442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10328 (or 10325 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 656999442 is about 25632.0003511236. Note that the first 3 decimals coincide. The cubic root of 656999442 is about 869.3373392300.

The spelling of 656999442 in words is "six hundred fifty-six million, nine hundred ninety-nine thousand, four hundred forty-two".