28730156 has 24 divisors (see below), whose sum is σ = 61881120. Its totient is φ = 11365632.

The previous prime is 28730131. The next prime is 28730161. The reversal of 28730156 is 65103782.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39101 + ... + 39828.

It is an arithmetic number, because the mean of its divisors is an integer number (2578380).

Almost surely, 2^28730156 is an apocalyptic number.

28730156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28730156 is an abundant number, since it is smaller than the sum of its proper divisors (33150964).

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

28730156 is a wasteful number, since it uses less digits than its factorization.

28730156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78953 (or 78951 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28730156 is about 5360.0518654207. The cubic root of 28730156 is about 306.2757848066.

The spelling of 28730156 in words is "twenty-eight million, seven hundred thirty thousand, one hundred fifty-six".