51901590 has 96 divisors (see below), whose sum is σ = 139929120. Its totient is φ = 12300288.

The previous prime is 51901589. The next prime is 51901607. The reversal of 51901590 is 9510915.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146854 + ... + 147206.

It is an arithmetic number, because the mean of its divisors is an integer number (1457595).

Almost surely, 2^51901590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51901590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69964560).

51901590 is an abundant number, since it is smaller than the sum of its proper divisors (88027530).

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

51901590 is a wasteful number, since it uses less digits than its factorization.

51901590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 51901590 is about 7204.2758137095. The cubic root of 51901590 is about 373.0155077443.

The spelling of 51901590 in words is "fifty-one million, nine hundred one thousand, five hundred ninety".