28733988 has 12 divisors (see below), whose sum is σ = 67046000. Its totient is φ = 9577992.

The previous prime is 28733987. The next prime is 28734031. The reversal of 28733988 is 88933782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×28733988³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28733987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197238 + ... + 1197261.

Almost surely, 2^28733988 is an apocalyptic number.

It is an amenable number.

28733988 is an abundant number, since it is smaller than the sum of its proper divisors (38312012).

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

28733988 is a wasteful number, since it uses less digits than its factorization.

28733988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394506 (or 2394504 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 28733988 is about 5360.4093127298. The cubic root of 28733988 is about 306.2894011224.

The spelling of 28733988 in words is "twenty-eight million, seven hundred thirty-three thousand, nine hundred eighty-eight".