656740420 has 48 divisors (see below), whose sum is σ = 1586269440. Its totient is φ = 223726464.

The previous prime is 656740393. The next prime is 656740421. The reversal of 656740420 is 24047656.

It is not an unprimeable number, because it can be changed into a prime (656740421) 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, 7041 + ... + 36919.

It is an arithmetic number, because the mean of its divisors is an integer number (33047280).

Almost surely, 2^656740420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656740420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793134720).

656740420 is an abundant number, since it is smaller than the sum of its proper divisors (929529020).

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

656740420 is a wasteful number, since it uses less digits than its factorization.

656740420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30052 (or 30050 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 656740420 is about 25626.9471455341. The cubic root of 656740420 is about 869.2230788109.

The spelling of 656740420 in words is "six hundred fifty-six million, seven hundred forty thousand, four hundred twenty".