51040638 has 64 divisors (see below), whose sum is σ = 128044800. Its totient is φ = 14928480.

The previous prime is 51040607. The next prime is 51040727. The reversal of 51040638 is 83604015.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 15745 + ... + 18707.

It is an arithmetic number, because the mean of its divisors is an integer number (2000700).

Almost surely, 2^51040638 is an apocalyptic number.

51040638 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51040638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64022400).

51040638 is an abundant number, since it is smaller than the sum of its proper divisors (77004162).

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

51040638 is a wasteful number, since it uses less digits than its factorization.

51040638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014 (or 3008 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51040638 is about 7144.2730910849. The cubic root of 51040638 is about 370.9414495794.

The spelling of 51040638 in words is "fifty-one million, forty thousand, six hundred thirty-eight".