51147504 has 80 divisors (see below), whose sum is σ = 147803040. Its totient is φ = 16934400.

The previous prime is 51147497. The next prime is 51147521. The reversal of 51147504 is 40574115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84804 + ... + 85404.

It is an arithmetic number, because the mean of its divisors is an integer number (1847538).

Almost surely, 2^51147504 is an apocalyptic number.

51147504 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51147504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73901520).

51147504 is an abundant number, since it is smaller than the sum of its proper divisors (96655536).

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

51147504 is a wasteful number, since it uses less digits than its factorization.

51147504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 51147504 is about 7151.7483177192. The cubic root of 51147504 is about 371.2001545159.

The spelling of 51147504 in words is "fifty-one million, one hundred forty-seven thousand, five hundred four".