51147420 has 24 divisors (see below), whose sum is σ = 143212944. Its totient is φ = 13639296.

The previous prime is 51147403. The next prime is 51147457. The reversal of 51147420 is 2474115.

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, 426169 + ... + 426288.

It is an arithmetic number, because the mean of its divisors is an integer number (5967206).

Almost surely, 2^51147420 is an apocalyptic number.

It is an amenable number.

51147420 is an abundant number, since it is smaller than the sum of its proper divisors (92065524).

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

51147420 is a wasteful number, since it uses less digits than its factorization.

51147420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852469 (or 852467 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 51147420 is about 7151.7424450269. The cubic root of 51147420 is about 371.1999513073.

The spelling of 51147420 in words is "fifty-one million, one hundred forty-seven thousand, four hundred twenty".