51523992 has 128 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 15534720.

The previous prime is 51523987. The next prime is 51524021. The reversal of 51523992 is 29932515.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165517 + ... + 165827.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^51523992 is an apocalyptic number.

51523992 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51523992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624000).

51523992 is an abundant number, since it is smaller than the sum of its proper divisors (105724008).

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

51523992 is a wasteful number, since it uses less digits than its factorization.

51523992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 388 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 51523992 is about 7178.0214544121. The cubic root of 51523992 is about 372.1087091239.

The spelling of 51523992 in words is "fifty-one million, five hundred twenty-three thousand, nine hundred ninety-two".