51472720 has 80 divisors (see below), whose sum is σ = 131991552. Its totient is φ = 18547200.

The previous prime is 51472697. The next prime is 51472727. The reversal of 51472720 is 2727415.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51472727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44145 + ... + 45295.

Almost surely, 2^51472720 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 51472720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65995776).

51472720 is an abundant number, since it is smaller than the sum of its proper divisors (80518832).

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

51472720 is a wasteful number, since it uses less digits than its factorization.

51472720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 51472720 is about 7174.4491077713. The cubic root of 51472720 is about 371.9852385556.

The spelling of 51472720 in words is "fifty-one million, four hundred seventy-two thousand, seven hundred twenty".