51705290 has 48 divisors (see below), whose sum is σ = 116606952. Its totient is φ = 16361856.

The previous prime is 51705239. The next prime is 51705293. The reversal of 51705290 is 9250715.

It can be written as a sum of positive squares in 4 ways, for example, as 43020481 + 8684809 = 6559^2 + 2947^2 .

It is not an unprimeable number, because it can be changed into a prime (51705293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2312 + ... + 10428.

Almost surely, 2^51705290 is an apocalyptic number.

51705290 is an abundant number, since it is smaller than the sum of its proper divisors (64901662).

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

51705290 is a wasteful number, since it uses less digits than its factorization.

51705290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8144 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 51705290 is about 7190.6390536586. The cubic root of 51705290 is about 372.5446457906.

The spelling of 51705290 in words is "fifty-one million, seven hundred five thousand, two hundred ninety".