28402840685 has 8 divisors (see below), whose sum is σ = 34332193656. Its totient is φ = 22556416000.

The previous prime is 28402840681. The next prime is 28402840703. The reversal of 28402840685 is 58604820482.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 150945796 + 28251894889 = 12286^2 + 168083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28402840685 - 2² = 28402840681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402840681) 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, 20731316 + ... + 20732685.

It is an arithmetic number, because the mean of its divisors is an integer number (4291524207).

Almost surely, 2^28402840685 is an apocalyptic number.

It is an amenable number.

28402840685 is a deficient number, since it is larger than the sum of its proper divisors (5929352971).

28402840685 is a wasteful number, since it uses less digits than its factorization.

28402840685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41464143.

The product of its (nonzero) digits is 983040, while the sum is 47.

The spelling of 28402840685 in words is "twenty-eight billion, four hundred two million, eight hundred forty thousand, six hundred eighty-five".