51192720 has 120 divisors (see below), whose sum is σ = 173931576. Its totient is φ = 13492224.

The previous prime is 51192697. The next prime is 51192761. The reversal of 51192720 is 2729115.

It can be written as a sum of positive squares in 4 ways, for example, as 17040384 + 34152336 = 4128^2 + 5844^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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, 69474 + ... + 70206.

Almost surely, 2^51192720 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 51192720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86965788).

51192720 is an abundant number, since it is smaller than the sum of its proper divisors (122738856).

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

51192720 is a wasteful number, since it uses less digits than its factorization.

51192720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 840 counting only the distinct ones).

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

The square root of 51192720 is about 7154.9088044503. The cubic root of 51192720 is about 371.3095064972.

The spelling of 51192720 in words is "fifty-one million, one hundred ninety-two thousand, seven hundred twenty".