28740408 has 32 divisors (see below), whose sum is σ = 72383760. Its totient is φ = 9509120.

The previous prime is 28740403. The next prime is 28740427. The reversal of 28740408 is 80404782.

It is a super-2 number, since 2×28740408² = 1652022104012928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740401) 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 7 ways as a sum of consecutive naturals, for example, 1083 + ... + 7658.

Almost surely, 2^28740408 is an apocalyptic number.

It is an amenable number.

28740408 is an abundant number, since it is smaller than the sum of its proper divisors (43643352).

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

28740408 is a wasteful number, since it uses less digits than its factorization.

28740408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8887 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28740408 is about 5361.0081141517. The cubic root of 28740408 is about 306.3122107132.

The spelling of 28740408 in words is "twenty-eight million, seven hundred forty thousand, four hundred eight".