51415488 has 84 divisors (see below), whose sum is σ = 153820368. Its totient is φ = 16389120.

The previous prime is 51415477. The next prime is 51415489. The reversal of 51415488 is 88451415.

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 (51415489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11308 + ... + 15188.

Almost surely, 2^51415488 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 51415488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76910184).

51415488 is an abundant number, since it is smaller than the sum of its proper divisors (102404880).

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

51415488 is a wasteful number, since it uses less digits than its factorization.

51415488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3922 (or 3909 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 51415488 is about 7170.4593995085. The cubic root of 51415488 is about 371.8473185430.

The spelling of 51415488 in words is "fifty-one million, four hundred fifteen thousand, four hundred eighty-eight".