28931740 has 12 divisors (see below), whose sum is σ = 60756696. Its totient is φ = 11572688.

The previous prime is 28931681. The next prime is 28931759. The reversal of 28931740 is 4713982.

It is a junction number, because it is equal to n+sod(n) for n = 28931696 and 28931705.

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, 723274 + ... + 723313.

It is an arithmetic number, because the mean of its divisors is an integer number (5063058).

Almost surely, 2^28931740 is an apocalyptic number.

28931740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28931740 is an abundant number, since it is smaller than the sum of its proper divisors (31824956).

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

28931740 is a wasteful number, since it uses less digits than its factorization.

28931740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446596 (or 1446594 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28931740 is about 5378.8232913900. The cubic root of 28931740 is about 306.9904399192.

The spelling of 28931740 in words is "twenty-eight million, nine hundred thirty-one thousand, seven hundred forty".