51373978 has 4 divisors (see below), whose sum is σ = 77060970. Its totient is φ = 25686988.

The previous prime is 51373939. The next prime is 51373997. The reversal of 51373978 is 87937315.

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., 30880249 + 20493729 = 5557^2 + 4527^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12843493 + ... + 12843496.

Almost surely, 2^51373978 is an apocalyptic number.

51373978 is a deficient number, since it is larger than the sum of its proper divisors (25686992).

51373978 is a wasteful number, since it uses less digits than its factorization.

51373978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25686991.

The product of its digits is 158760, while the sum is 43.

The square root of 51373978 is about 7167.5643003743. The cubic root of 51373978 is about 371.7472219992.

The spelling of 51373978 in words is "fifty-one million, three hundred seventy-three thousand, nine hundred seventy-eight".