51123278 has 24 divisors (see below), whose sum is σ = 80623656. Its totient is φ = 24306480.

The previous prime is 51123277. The next prime is 51123311. The reversal of 51123278 is 87232115.

It is a super-2 number, since 2×51123278² = 5227179106930568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51123278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128576 + ... + 128972.

It is an arithmetic number, because the mean of its divisors is an integer number (3359319).

Almost surely, 2^51123278 is an apocalyptic number.

51123278 is a deficient number, since it is larger than the sum of its proper divisors (29500378).

51123278 is a wasteful number, since it uses less digits than its factorization.

51123278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 497 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 51123278 is about 7150.0544053874. The cubic root of 51123278 is about 371.1415389797.

The spelling of 51123278 in words is "fifty-one million, one hundred twenty-three thousand, two hundred seventy-eight".