51120972 has 72 divisors (see below), whose sum is σ = 156383136. Its totient is φ = 13745664.

The previous prime is 51120943. The next prime is 51121009. The reversal of 51120972 is 27902115.

It is a super-2 number, since 2×51120972² = 5226707556449568, which contains 22 as substring.

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, 1683 + ... + 10250.

It is an arithmetic number, because the mean of its divisors is an integer number (2171988).

Almost surely, 2^51120972 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 51120972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78191568).

51120972 is an abundant number, since it is smaller than the sum of its proper divisors (105262164).

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

51120972 is a wasteful number, since it uses less digits than its factorization.

51120972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11967 (or 11962 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51120972 is about 7149.8931460547. The cubic root of 51120972 is about 371.1359585782.

The spelling of 51120972 in words is "fifty-one million, one hundred twenty thousand, nine hundred seventy-two".