51870240 has 96 divisors (see below), whose sum is σ = 181560960. Its totient is φ = 13830912.

The previous prime is 51870233. The next prime is 51870251. The reversal of 51870240 is 4207815.

It is a tau number, because it is divible by the number of its divisors (96).

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

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, 1684 + ... + 10323.

It is an arithmetic number, because the mean of its divisors is an integer number (1891260).

Almost surely, 2^51870240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51870240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90780480).

51870240 is an abundant number, since it is smaller than the sum of its proper divisors (129690720).

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

51870240 is a wasteful number, since it uses less digits than its factorization.

51870240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12031 (or 12017 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51870240 is about 7202.0996938393. The cubic root of 51870240 is about 372.9403887132.

The spelling of 51870240 in words is "fifty-one million, eight hundred seventy thousand, two hundred forty".