51625290 has 16 divisors (see below), whose sum is σ = 123900768. Its totient is φ = 13766736.

The previous prime is 51625289. The next prime is 51625297. The reversal of 51625290 is 9252615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1720843 = 51625290 / (5 + 1 + 6 + 2 + 5 + 2 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (51625297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860392 + ... + 860451.

It is an arithmetic number, because the mean of its divisors is an integer number (7743798).

Almost surely, 2^51625290 is an apocalyptic number.

51625290 is an abundant number, since it is smaller than the sum of its proper divisors (72275478).

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

51625290 is a wasteful number, since it uses less digits than its factorization.

51625290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720853.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51625290 is about 7185.0741123526. The cubic root of 51625290 is about 372.3524091363.

It can be divided in two parts, 51625 and 290, that added together give a palindrome (51915).

The spelling of 51625290 in words is "fifty-one million, six hundred twenty-five thousand, two hundred ninety".