28756929 has 8 divisors (see below), whose sum is σ = 38401920. Its totient is φ = 19141616.

The previous prime is 28756921. The next prime is 28756939. The reversal of 28756929 is 92965782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28756929 - 2³ = 28756921 is a prime.

It is a super-2 number, since 2×28756929² = 1653921931022082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28756921) 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, 5049 + ... + 9110.

It is an arithmetic number, because the mean of its divisors is an integer number (4800240).

Almost surely, 2^28756929 is an apocalyptic number.

It is an amenable number.

28756929 is a deficient number, since it is larger than the sum of its proper divisors (9644991).

28756929 is a wasteful number, since it uses less digits than its factorization.

28756929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14839.

The product of its digits is 544320, while the sum is 48.

The square root of 28756929 is about 5362.5487410372. The cubic root of 28756929 is about 306.3708924906.

The spelling of 28756929 in words is "twenty-eight million, seven hundred fifty-six thousand, nine hundred twenty-nine".