51494580 has 72 divisors (see below), whose sum is σ = 156784992. Its totient is φ = 13680576.

The previous prime is 51494567. The next prime is 51494591. The reversal of 51494580 is 8549415.

51494580 is a `hidden beast` number, since 514 + 94 + 58 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 23 ways as a sum of consecutive naturals, for example, 93867 + ... + 94413.

Almost surely, 2^51494580 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 51494580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78392496).

51494580 is an abundant number, since it is smaller than the sum of its proper divisors (105290412).

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

51494580 is a wasteful number, since it uses less digits than its factorization.

51494580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1080 counting only the distinct ones).

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

The square root of 51494580 is about 7175.9724079737. The cubic root of 51494580 is about 372.0378906947.

The spelling of 51494580 in words is "fifty-one million, four hundred ninety-four thousand, five hundred eighty".