51556722 has 48 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 14220192.

The previous prime is 51556717. The next prime is 51556787. The reversal of 51556722 is 22765515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5503 + ... + 11549.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^51556722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51556722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62052480).

51556722 is an abundant number, since it is smaller than the sum of its proper divisors (72548238).

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

51556722 is a wasteful number, since it uses less digits than its factorization.

51556722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095 (or 6088 counting only the distinct ones).

The product of its digits is 21000, while the sum is 33.

The square root of 51556722 is about 7180.3009686224. The cubic root of 51556722 is about 372.1874849822.

The spelling of 51556722 in words is "fifty-one million, five hundred fifty-six thousand, seven hundred twenty-two".