51756442 has 4 divisors (see below), whose sum is σ = 77634666. Its totient is φ = 25878220.

The previous prime is 51756433. The next prime is 51756469. The reversal of 51756442 is 24465715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35748441 + 16008001 = 5979^2 + 4001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51756398 and 51756407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12939109 + ... + 12939112.

Almost surely, 2^51756442 is an apocalyptic number.

51756442 is a deficient number, since it is larger than the sum of its proper divisors (25878224).

51756442 is a wasteful number, since it uses less digits than its factorization.

51756442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25878223.

The product of its digits is 33600, while the sum is 34.

The square root of 51756442 is about 7194.1950209874. The cubic root of 51756442 is about 372.6674580020.

The spelling of 51756442 in words is "fifty-one million, seven hundred fifty-six thousand, four hundred forty-two".