5257421988 has 48 divisors (see below), whose sum is σ = 15098240640. Its totient is φ = 1386572544.

The previous prime is 5257421969. The next prime is 5257421993. The reversal of 5257421988 is 8891247525.

It is a self number, because there is not a number n which added to its sum of digits gives 5257421988.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2406153 + ... + 2408336.

It is an arithmetic number, because the mean of its divisors is an integer number (314546680).

Almost surely, 2^5257421988 is an apocalyptic number.

It is an amenable number.

5257421988 is an abundant number, since it is smaller than the sum of its proper divisors (9840818652).

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

5257421988 is a wasteful number, since it uses less digits than its factorization.

5257421988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814516 (or 4814514 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The square root of 5257421988 is about 72508.0822253630. The cubic root of 5257421988 is about 1738.8319535582.

The spelling of 5257421988 in words is "five billion, two hundred fifty-seven million, four hundred twenty-one thousand, nine hundred eighty-eight".