28154240 has 32 divisors (see below), whose sum is σ = 67307760. Its totient is φ = 11261440.

The previous prime is 28154237. The next prime is 28154251. The reversal of 28154240 is 4245182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×28154240² = 1585322459955200, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 21356 + ... + 22635.

Almost surely, 2^28154240 is an apocalyptic number.

28154240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28154240 is an abundant number, since it is smaller than the sum of its proper divisors (39153520).

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

28154240 is an equidigital number, since it uses as much as digits as its factorization.

28154240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44010 (or 43998 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28154240 is about 5306.0569163928. The cubic root of 28154240 is about 304.2154520694.

The spelling of 28154240 in words is "twenty-eight million, one hundred fifty-four thousand, two hundred forty".