28023740 has 12 divisors (see below), whose sum is σ = 58849896. Its totient is φ = 11209488.

The previous prime is 28023739. The next prime is 28023757. The reversal of 28023740 is 4732082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700574 + ... + 700613.

It is an arithmetic number, because the mean of its divisors is an integer number (4904158).

Almost surely, 2^28023740 is an apocalyptic number.

28023740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28023740 is an abundant number, since it is smaller than the sum of its proper divisors (30826156).

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

28023740 is a wasteful number, since it uses less digits than its factorization.

28023740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401196 (or 1401194 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28023740 is about 5293.7453659956. The cubic root of 28023740 is about 303.7446927330.

The spelling of 28023740 in words is "twenty-eight million, twenty-three thousand, seven hundred forty".