51988770 has 64 divisors (see below), whose sum is σ = 139587840. Its totient is φ = 13768704.

The previous prime is 51988759. The next prime is 51988789. The reversal of 51988770 is 7788915.

It is a super-2 number, since 2×51988770² = 5405664412225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44514 + ... + 45666.

It is an arithmetic number, because the mean of its divisors is an integer number (2181060).

Almost surely, 2^51988770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51988770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69793920).

51988770 is an abundant number, since it is smaller than the sum of its proper divisors (87599070).

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

51988770 is a wasteful number, since it uses less digits than its factorization.

51988770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 51988770 is about 7210.3238484828. The cubic root of 51988770 is about 373.2242444522.

The spelling of 51988770 in words is "fifty-one million, nine hundred eighty-eight thousand, seven hundred seventy".