28919736 has 48 divisors (see below), whose sum is σ = 80154360. Its totient is φ = 9414720.

The previous prime is 28919731. The next prime is 28919747. The reversal of 28919736 is 63791982.

28919736 = T₁₂₈ + T₁₂₉ + ... + T₅₅₉.

It is a super-2 number, since 2×28919736² = 1672702260619392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28919691 and 28919700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1575 + ... + 7766.

Almost surely, 2^28919736 is an apocalyptic number.

It is an amenable number.

28919736 is an abundant number, since it is smaller than the sum of its proper divisors (51234624).

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

28919736 is a wasteful number, since it uses less digits than its factorization.

28919736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396 (or 9389 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 28919736 is about 5377.7073181794. The cubic root of 28919736 is about 306.9479764861.

The spelling of 28919736 in words is "twenty-eight million, nine hundred nineteen thousand, seven hundred thirty-six".