51439284 has 36 divisors (see below), whose sum is σ = 140030436. Its totient is φ = 15827328.

The previous prime is 51439279. The next prime is 51439303. The reversal of 51439284 is 48293415.

It can be written as a sum of positive squares in 2 ways, for example, as 11370384 + 40068900 = 3372^2 + 6330^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 54489 + ... + 55424.

Almost surely, 2^51439284 is an apocalyptic number.

It is an amenable number.

51439284 is an abundant number, since it is smaller than the sum of its proper divisors (88591152).

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

51439284 is a wasteful number, since it uses less digits than its factorization.

51439284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109936 (or 109931 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 51439284 is about 7172.1185154737. The cubic root of 51439284 is about 371.9046755406.

The spelling of 51439284 in words is "fifty-one million, four hundred thirty-nine thousand, two hundred eighty-four".