51238902 has 96 divisors (see below), whose sum is σ = 124679520. Its totient is φ = 13939200.

The previous prime is 51238897. The next prime is 51238903. The reversal of 51238902 is 20983215.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51238902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51238903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 575674 + ... + 575762.

It is an arithmetic number, because the mean of its divisors is an integer number (1298745).

Almost surely, 2^51238902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51238902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62339760).

51238902 is an abundant number, since it is smaller than the sum of its proper divisors (73440618).

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

51238902 is a wasteful number, since it uses less digits than its factorization.

51238902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51238902 is about 7158.1353717291. The cubic root of 51238902 is about 371.4211282391.

The spelling of 51238902 in words is "fifty-one million, two hundred thirty-eight thousand, nine hundred two".