51358644 has 48 divisors (see below), whose sum is σ = 133672000. Its totient is φ = 17052768.

The previous prime is 51358633. The next prime is 51358663. The reversal of 51358644 is 44685315.

It is a happy number.

51358644 is a `hidden beast` number, since 5 + 1 + 3 + 5 + 8 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51358599 and 51358608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32382 + ... + 33930.

Almost surely, 2^51358644 is an apocalyptic number.

51358644 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51358644 is an abundant number, since it is smaller than the sum of its proper divisors (82313356).

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

51358644 is a wasteful number, since it uses less digits than its factorization.

51358644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869 (or 1861 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 51358644 is about 7166.4945405686. The cubic root of 51358644 is about 371.7102322016.

The spelling of 51358644 in words is "fifty-one million, three hundred fifty-eight thousand, six hundred forty-four".