51560388 has 240 divisors, whose sum is σ = 166852224. Its totient is φ = 13685760.

The previous prime is 51560387. The next prime is 51560389. The reversal of 51560388 is 88306515.

51560388 is a `hidden beast` number, since 515 + 60 + 3 + 88 = 666.

It is an interprime number because it is at equal distance from previous prime (51560387) and next prime (51560389).

It is a super-2 number, since 2×51560388² = 5316947221421088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51560387) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1393506 + ... + 1393542.

Almost surely, 2^51560388 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 51560388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83426112).

51560388 is an abundant number, since it is smaller than the sum of its proper divisors (115291836).

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

51560388 is a wasteful number, since it uses less digits than its factorization.

51560388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51560388 is about 7180.5562458629. The cubic root of 51560388 is about 372.1963063795.

The spelling of 51560388 in words is "fifty-one million, five hundred sixty thousand, three hundred eighty-eight".