51620388 has 12 divisors (see below), whose sum is σ = 120447600. Its totient is φ = 17206792.

The previous prime is 51620383. The next prime is 51620389. The reversal of 51620388 is 88302615.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51620383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150838 + ... + 2150861.

It is an arithmetic number, because the mean of its divisors is an integer number (10037300).

Almost surely, 2^51620388 is an apocalyptic number.

It is an amenable number.

51620388 is an abundant number, since it is smaller than the sum of its proper divisors (68827212).

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

51620388 is a wasteful number, since it uses less digits than its factorization.

51620388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301706 (or 4301704 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 51620388 is about 7184.7329804245. The cubic root of 51620388 is about 372.3406233798.

The spelling of 51620388 in words is "fifty-one million, six hundred twenty thousand, three hundred eighty-eight".