51506478 has 12 divisors (see below), whose sum is σ = 111597408. Its totient is φ = 17168820.

The previous prime is 51506471. The next prime is 51506491. The reversal of 51506478 is 87460515.

51506478 is a `hidden beast` number, since 5 + 1 + 5 + 0 + 647 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1430718 + ... + 1430753.

It is an arithmetic number, because the mean of its divisors is an integer number (9299784).

Almost surely, 2^51506478 is an apocalyptic number.

51506478 is an abundant number, since it is smaller than the sum of its proper divisors (60090930).

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

51506478 is a wasteful number, since it uses less digits than its factorization.

51506478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861479 (or 2861476 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 51506478 is about 7176.8013766580. The cubic root of 51506478 is about 372.0665420334.

It can be divided in two parts, 51506 and 478, that added together give a square (51984 = 228²).

The spelling of 51506478 in words is "fifty-one million, five hundred six thousand, four hundred seventy-eight".