51724620 has 72 divisors (see below), whose sum is σ = 158348736. Its totient is φ = 13665792.

The previous prime is 51724609. The next prime is 51724633. The reversal of 51724620 is 2642715.

51724620 is a `hidden beast` number, since 5 + 17 + 24 + 620 = 666.

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, 19069 + ... + 21611.

It is an arithmetic number, because the mean of its divisors is an integer number (2199288).

Almost surely, 2^51724620 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 51724620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79174368).

51724620 is an abundant number, since it is smaller than the sum of its proper divisors (106624116).

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

51724620 is a wasteful number, since it uses less digits than its factorization.

51724620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671 (or 2666 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51724620 is about 7191.9830366874. The cubic root of 51724620 is about 372.5910652240.

The spelling of 51724620 in words is "fifty-one million, seven hundred twenty-four thousand, six hundred twenty".