51897209628 has 48 divisors (see below), whose sum is σ = 132280033536. Its totient is φ = 15705231360.

The previous prime is 51897209627. The next prime is 51897209633. The reversal of 51897209628 is 82690279815.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897209627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166501 + ... + 362652.

It is an arithmetic number, because the mean of its divisors is an integer number (2755834032).

Almost surely, 2^51897209628 is an apocalyptic number.

It is an amenable number.

51897209628 is an abundant number, since it is smaller than the sum of its proper divisors (80382823908).

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

51897209628 is a wasteful number, since it uses less digits than its factorization.

51897209628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529914 (or 529912 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 51897209628 in words is "fifty-one billion, eight hundred ninety-seven million, two hundred nine thousand, six hundred twenty-eight".