51402474 has 24 divisors (see below), whose sum is σ = 113475492. Its totient is φ = 16810560.

The previous prime is 51402473. The next prime is 51402503. The reversal of 51402474 is 47420415.

It can be written as a sum of positive squares in 2 ways, for example, as 50509449 + 893025 = 7107^2 + 945^2 .

It is not an unprimeable number, because it can be changed into a prime (51402473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25987 + ... + 27894.

Almost surely, 2^51402474 is an apocalyptic number.

51402474 is an abundant number, since it is smaller than the sum of its proper divisors (62073018).

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

51402474 is a wasteful number, since it uses less digits than its factorization.

51402474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53942 (or 53939 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 51402474 is about 7169.5518688409. The cubic root of 51402474 is about 371.8159425930.

Adding to 51402474 its reverse (47420415), we get a palindrome (98822889).

The spelling of 51402474 in words is "fifty-one million, four hundred two thousand, four hundred seventy-four".