28451388 has 24 divisors (see below), whose sum is σ = 75870592. Its totient is φ = 8128944.

The previous prime is 28451369. The next prime is 28451399. The reversal of 28451388 is 88315482.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169270 + ... + 169437.

Almost surely, 2^28451388 is an apocalyptic number.

28451388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28451388 is an abundant number, since it is smaller than the sum of its proper divisors (47419204).

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

28451388 is a wasteful number, since it uses less digits than its factorization.

28451388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338721 (or 338719 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 28451388 is about 5333.9842519453. The cubic root of 28451388 is about 305.2819680359.

The spelling of 28451388 in words is "twenty-eight million, four hundred fifty-one thousand, three hundred eighty-eight".