51977220 has 48 divisors (see below), whose sum is σ = 146525568. Its totient is φ = 13766400.

The previous prime is 51977209. The next prime is 51977257. The reversal of 51977220 is 2277915.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6192 + ... + 11928.

It is an arithmetic number, because the mean of its divisors is an integer number (3052616).

Almost surely, 2^51977220 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 51977220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73262784).

51977220 is an abundant number, since it is smaller than the sum of its proper divisors (94548348).

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

51977220 is a wasteful number, since it uses less digits than its factorization.

51977220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5900 (or 5898 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 51977220 is about 7209.5228690947. The cubic root of 51977220 is about 373.1966034873.

The spelling of 51977220 in words is "fifty-one million, nine hundred seventy-seven thousand, two hundred twenty".