51939480 has 64 divisors (see below), whose sum is σ = 156556800. Its totient is φ = 13784960.

The previous prime is 51939467. The next prime is 51939509. The reversal of 51939480 is 8493915.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 27775 + ... + 29585.

It is an arithmetic number, because the mean of its divisors is an integer number (2446200).

Almost surely, 2^51939480 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 51939480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78278400).

51939480 is an abundant number, since it is smaller than the sum of its proper divisors (104617320).

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

51939480 is a wasteful number, since it uses less digits than its factorization.

51939480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 51939480 is about 7206.9050222686. The cubic root of 51939480 is about 373.1062571777.

The spelling of 51939480 in words is "fifty-one million, nine hundred thirty-nine thousand, four hundred eighty".