51520770 has 96 divisors (see below), whose sum is σ = 156079872. Its totient is φ = 11546496.

The previous prime is 51520757. The next prime is 51520787. The reversal of 51520770 is 7702515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32619 + ... + 34161.

It is an arithmetic number, because the mean of its divisors is an integer number (1625832).

Almost surely, 2^51520770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78039936).

51520770 is an abundant number, since it is smaller than the sum of its proper divisors (104559102).

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

51520770 is a wasteful number, since it uses less digits than its factorization.

51520770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 51520770 is about 7177.7970157981. The cubic root of 51520770 is about 372.1009524833.

The spelling of 51520770 in words is "fifty-one million, five hundred twenty thousand, seven hundred seventy".