52689721428 has 60 divisors (see below), whose sum is σ = 137763245620. Its totient is φ = 17560447488.

The previous prime is 52689721391. The next prime is 52689721433. The reversal of 52689721428 is 82412798625.

52689721428 is a `hidden beast` number, since 52 + 68 + 97 + 21 + 428 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24630791364 + 28058930064 = 156942^2 + 167508^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3488100 + ... + 3503172.

Almost surely, 2^52689721428 is an apocalyptic number.

It is an amenable number.

52689721428 is an abundant number, since it is smaller than the sum of its proper divisors (85073524192).

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

52689721428 is a wasteful number, since it uses less digits than its factorization.

52689721428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25878 (or 25867 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 52689721428 in words is "fifty-two billion, six hundred eighty-nine million, seven hundred twenty-one thousand, four hundred twenty-eight".