51420656 has 20 divisors (see below), whose sum is σ = 113860272. Its totient is φ = 22037376.

The previous prime is 51420637. The next prime is 51420659. The reversal of 51420656 is 65602415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51420659) 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, 229445 + ... + 229668.

Almost surely, 2^51420656 is an apocalyptic number.

51420656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51420656 is an abundant number, since it is smaller than the sum of its proper divisors (62439616).

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

51420656 is a wasteful number, since it uses less digits than its factorization.

51420656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459128 (or 459122 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 51420656 is about 7170.8197578798. The cubic root of 51420656 is about 371.8597768031.

The spelling of 51420656 in words is "fifty-one million, four hundred twenty thousand, six hundred fifty-six".