28940730 has 64 divisors (see below), whose sum is σ = 85494528. Its totient is φ = 6105600.

The previous prime is 28940729. The next prime is 28940731. The reversal of 28940730 is 3704982.

It is an interprime number because it is at equal distance from previous prime (28940729) and next prime (28940731).

It is a junction number, because it is equal to n+sod(n) for n = 28940691 and 28940700.

It is not an unprimeable number, because it can be changed into a prime (28940731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2571 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (1335852).

Almost surely, 2^28940730 is an apocalyptic number.

28940730 is an abundant number, since it is smaller than the sum of its proper divisors (56553798).

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

28940730 is a wasteful number, since it uses less digits than its factorization.

28940730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28940730 is about 5379.6589111207. The cubic root of 28940730 is about 307.0222338157.

The spelling of 28940730 in words is "twenty-eight million, nine hundred forty thousand, seven hundred thirty".