51690528 has 96 divisors (see below), whose sum is σ = 156038400. Its totient is φ = 16627968.

The previous prime is 51690503. The next prime is 51690539. The reversal of 51690528 is 82509615.

It is a happy number.

51690528 is a `hidden beast` number, since 516 + 90 + 52 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a junction number, because it is equal to n+sod(n) for n = 51690492 and 51690501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24025 + ... + 26087.

It is an arithmetic number, because the mean of its divisors is an integer number (1625400).

Almost surely, 2^51690528 is an apocalyptic number.

51690528 is a gapful number since it is divisible by the number (58) 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 51690528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78019200).

51690528 is an abundant number, since it is smaller than the sum of its proper divisors (104347872).

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

51690528 is a wasteful number, since it uses less digits than its factorization.

51690528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2097 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 51690528 is about 7189.6125069436. The cubic root of 51690528 is about 372.5091882484.

The spelling of 51690528 in words is "fifty-one million, six hundred ninety thousand, five hundred twenty-eight".