51338490 has 64 divisors (see below), whose sum is σ = 141834240. Its totient is φ = 11649600.

The previous prime is 51338489. The next prime is 51338501. The reversal of 51338490 is 9483315.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30901 + ... + 32519.

It is an arithmetic number, because the mean of its divisors is an integer number (2216160).

Almost surely, 2^51338490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51338490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70917120).

51338490 is an abundant number, since it is smaller than the sum of its proper divisors (90495750).

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

51338490 is a wasteful number, since it uses less digits than its factorization.

51338490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 51338490 is about 7165.0882757995. The cubic root of 51338490 is about 371.6616040476.

The spelling of 51338490 in words is "fifty-one million, three hundred thirty-eight thousand, four hundred ninety".