51493320 has 160 divisors (see below), whose sum is σ = 180861120. Its totient is φ = 13115520.

The previous prime is 51493313. The next prime is 51493367. The reversal of 51493320 is 2339415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 74175 + ... + 74865.

It is an arithmetic number, because the mean of its divisors is an integer number (1130382).

Almost surely, 2^51493320 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 51493320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90430560).

51493320 is an abundant number, since it is smaller than the sum of its proper divisors (129367800).

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

51493320 is a wasteful number, since it uses less digits than its factorization.

51493320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 51493320 is about 7175.8846144570. The cubic root of 51493320 is about 372.0348562552.

The spelling of 51493320 in words is "fifty-one million, four hundred ninety-three thousand, three hundred twenty".