51115278 has 32 divisors (see below), whose sum is σ = 105626016. Its totient is φ = 16478208.

The previous prime is 51115271. The next prime is 51115289. The reversal of 51115278 is 87251115.

It is a super-2 number, since 2×51115278² = 5225543290034568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42250 + ... + 43442.

It is an arithmetic number, because the mean of its divisors is an integer number (3300813).

Almost surely, 2^51115278 is an apocalyptic number.

51115278 is an abundant number, since it is smaller than the sum of its proper divisors (54510738).

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

51115278 is a wasteful number, since it uses less digits than its factorization.

51115278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

The product of its digits is 2800, while the sum is 30.

The square root of 51115278 is about 7149.4949471973. The cubic root of 51115278 is about 371.1221786719.

The spelling of 51115278 in words is "fifty-one million, one hundred fifteen thousand, two hundred seventy-eight".