28172689402 has 32 divisors (see below), whose sum is σ = 49975841664. Its totient is φ = 11742408000.

The previous prime is 28172689399. The next prime is 28172689403. The reversal of 28172689402 is 20498627182.

It is a super-3 number, since 3×28172689402³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28172689403) 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, 282993 + ... + 369364.

It is an arithmetic number, because the mean of its divisors is an integer number (1561745052).

Almost surely, 2^28172689402 is an apocalyptic number.

28172689402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28172689402 is a deficient number, since it is larger than the sum of its proper divisors (21803152262).

28172689402 is a wasteful number, since it uses less digits than its factorization.

28172689402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652534.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 28172689402 in words is "twenty-eight billion, one hundred seventy-two million, six hundred eighty-nine thousand, four hundred two".