28742500 has 30 divisors (see below), whose sum is σ = 62859566. Its totient is φ = 11496000.

The previous prime is 28742489. The next prime is 28742503. The reversal of 28742500 is 524782.

It can be written as a sum of positive squares in 5 ways, for example, as 9872164 + 18870336 = 3142^2 + 4344^2 .

It is a super-2 number, since 2×28742500² = 1652262612500000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28742503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3249 + ... + 8248.

Almost surely, 2^28742500 is an apocalyptic number.

28742500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28742500 is an abundant number, since it is smaller than the sum of its proper divisors (34117066).

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

28742500 is a wasteful number, since it uses less digits than its factorization.

28742500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11521 (or 11504 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28742500 is about 5361.2032231580. The cubic root of 28742500 is about 306.3196426374.

The spelling of 28742500 in words is "twenty-eight million, seven hundred forty-two thousand, five hundred".