51123478 has 16 divisors (see below), whose sum is σ = 87763104. Its totient is φ = 21879360.

The previous prime is 51123463. The next prime is 51123487. The reversal of 51123478 is 87432115.

It is a super-2 number, since 2×51123478² = 5227220005632968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9868 + ... + 14128.

It is an arithmetic number, because the mean of its divisors is an integer number (5485194).

Almost surely, 2^51123478 is an apocalyptic number.

51123478 is a deficient number, since it is larger than the sum of its proper divisors (36639626).

51123478 is a wasteful number, since it uses less digits than its factorization.

51123478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127.

The product of its digits is 6720, while the sum is 31.

The square root of 51123478 is about 7150.0683912813. The cubic root of 51123478 is about 371.1420229615.

The spelling of 51123478 in words is "fifty-one million, one hundred twenty-three thousand, four hundred seventy-eight".