28901040 has 80 divisors (see below), whose sum is σ = 102398208. Its totient is φ = 6605568.

The previous prime is 28901029. The next prime is 28901057. The reversal of 28901040 is 4010982.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×28901040² = 1670540226163200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28901040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6922 + ... + 10281.

Almost surely, 2^28901040 is an apocalyptic number.

28901040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28901040 is an abundant number, since it is smaller than the sum of its proper divisors (73497168).

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

28901040 is a wasteful number, since it uses less digits than its factorization.

28901040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17226 (or 17220 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28901040 is about 5375.9687499092. The cubic root of 28901040 is about 306.8818170939.

The spelling of 28901040 in words is "twenty-eight million, nine hundred one thousand, forty".