51246240 has 96 divisors (see below), whose sum is σ = 162461376. Its totient is φ = 13578240.

The previous prime is 51246227. The next prime is 51246271. The reversal of 51246240 is 4264215.

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

It is a super-2 number, since 2×51246240² = 5252354228275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 51246240.

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, 115459 + ... + 115901.

It is an arithmetic number, because the mean of its divisors is an integer number (1692306).

Almost surely, 2^51246240 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 51246240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81230688).

51246240 is an abundant number, since it is smaller than the sum of its proper divisors (111215136).

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

51246240 is a wasteful number, since it uses less digits than its factorization.

51246240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 51246240 is about 7158.6479170301. The cubic root of 51246240 is about 371.4388579851.

The spelling of 51246240 in words is "fifty-one million, two hundred forty-six thousand, two hundred forty".