28057740 has 24 divisors (see below), whose sum is σ = 78561840. Its totient is φ = 7482048.

The previous prime is 28057739. The next prime is 28057741. The reversal of 28057740 is 4775082.

It is an interprime number because it is at equal distance from previous prime (28057739) and next prime (28057741).

It is not an unprimeable number, because it can be changed into a prime (28057741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233755 + ... + 233874.

It is an arithmetic number, because the mean of its divisors is an integer number (3273410).

Almost surely, 2^28057740 is an apocalyptic number.

28057740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28057740 is an abundant number, since it is smaller than the sum of its proper divisors (50504100).

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

28057740 is a wasteful number, since it uses less digits than its factorization.

28057740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467641 (or 467639 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28057740 is about 5296.9557294733. The cubic root of 28057740 is about 303.8674832171.

The spelling of 28057740 in words is "twenty-eight million, fifty-seven thousand, seven hundred forty".