51466590 has 160 divisors (see below), whose sum is σ = 164134080. Its totient is φ = 11321856.

The previous prime is 51466589. The next prime is 51466601. The reversal of 51466590 is 9566415.

51466590 is a `hidden beast` number, since 5 + 1 + 4 + 66 + 590 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 164274 + ... + 164586.

It is an arithmetic number, because the mean of its divisors is an integer number (1025838).

Almost surely, 2^51466590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51466590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82067040).

51466590 is an abundant number, since it is smaller than the sum of its proper divisors (112667490).

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

51466590 is a wasteful number, since it uses less digits than its factorization.

51466590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 51466590 is about 7174.0218845498. The cubic root of 51466590 is about 371.9704711212.

The spelling of 51466590 in words is "fifty-one million, four hundred sixty-six thousand, five hundred ninety".