28030540 has 36 divisors (see below), whose sum is σ = 59908464. Its totient is φ = 11016576.

The previous prime is 28030531. The next prime is 28030547. The reversal of 28030540 is 4503082.

It is a super-2 number, since 2×28030540² = 1571422345383200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28030547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106449 + ... + 106711.

It is an arithmetic number, because the mean of its divisors is an integer number (1664124).

Almost surely, 2^28030540 is an apocalyptic number.

28030540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28030540 is an abundant number, since it is smaller than the sum of its proper divisors (31877924).

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

28030540 is a wasteful number, since it uses less digits than its factorization.

28030540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28030540 is about 5294.3875944249. The cubic root of 28030540 is about 303.7692587720.

The spelling of 28030540 in words is "twenty-eight million, thirty thousand, five hundred forty".