51641904 has 40 divisors (see below), whose sum is σ = 134602992. Its totient is φ = 17059840.

The previous prime is 51641897. The next prime is 51641957. The reversal of 51641904 is 40914615.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664 + ... + 10184.

Almost surely, 2^51641904 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 51641904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67301496).

51641904 is an abundant number, since it is smaller than the sum of its proper divisors (82961088).

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

51641904 is a wasteful number, since it uses less digits than its factorization.

51641904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9645 (or 9639 counting only the distinct ones).

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

The square root of 51641904 is about 7186.2301660885. The cubic root of 51641904 is about 372.3923482141.

The spelling of 51641904 in words is "fifty-one million, six hundred forty-one thousand, nine hundred four".