51474778 has 4 divisors (see below), whose sum is σ = 77212170. Its totient is φ = 25737388.

The previous prime is 51474769. The next prime is 51474779. The reversal of 51474778 is 87747415.

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., 36397089 + 15077689 = 6033^2 + 3883^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (51474779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12868693 + ... + 12868696.

Almost surely, 2^51474778 is an apocalyptic number.

51474778 is a deficient number, since it is larger than the sum of its proper divisors (25737392).

51474778 is a wasteful number, since it uses less digits than its factorization.

51474778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25737391.

The product of its digits is 219520, while the sum is 43.

The square root of 51474778 is about 7174.5925319840. The cubic root of 51474778 is about 371.9901961034.

The spelling of 51474778 in words is "fifty-one million, four hundred seventy-four thousand, seven hundred seventy-eight".