51504072 has 16 divisors (see below), whose sum is σ = 128760240. Its totient is φ = 17168016.

The previous prime is 51504059. The next prime is 51504083. The reversal of 51504072 is 27040515.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2146003 = 51504072 / (5 + 1 + 5 + 0 + 4 + 0 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072978 + ... + 1073025.

It is an arithmetic number, because the mean of its divisors is an integer number (8047515).

Almost surely, 2^51504072 is an apocalyptic number.

It is an amenable number.

51504072 is an abundant number, since it is smaller than the sum of its proper divisors (77256168).

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

51504072 is a wasteful number, since it uses less digits than its factorization.

51504072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146012 (or 2146008 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51504072 is about 7176.6337512792. The cubic root of 51504072 is about 372.0607485483.

Adding to 51504072 its reverse (27040515), we get a palindrome (78544587).

The spelling of 51504072 in words is "fifty-one million, five hundred four thousand, seventy-two".