51278930 has 16 divisors (see below), whose sum is σ = 92838744. Its totient is φ = 20392320.

The previous prime is 51278911. The next prime is 51278933. The reversal of 51278930 is 3987215.

It can be written as a sum of positive squares in 4 ways, for example, as 51136801 + 142129 = 7151^2 + 377^2 .

It is not an unprimeable number, because it can be changed into a prime (51278933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13091 + ... + 16550.

Almost surely, 2^51278930 is an apocalyptic number.

51278930 is a deficient number, since it is larger than the sum of its proper divisors (41559814).

51278930 is a wasteful number, since it uses less digits than its factorization.

51278930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29821.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 51278930 is about 7160.9308054191. The cubic root of 51278930 is about 371.5178215364.

The spelling of 51278930 in words is "fifty-one million, two hundred seventy-eight thousand, nine hundred thirty".