28954781 has 16 divisors (see below), whose sum is σ = 30697920. Its totient is φ = 27283200.

The previous prime is 28954771. The next prime is 28954811. The reversal of 28954781 is 18745982.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28954781 is a prime.

It is a super-2 number, since 2×28954781² = 1676758685515922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28954711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256181 + ... + 256293.

It is an arithmetic number, because the mean of its divisors is an integer number (1918620).

Almost surely, 2^28954781 is an apocalyptic number.

It is an amenable number.

28954781 is a deficient number, since it is larger than the sum of its proper divisors (1743139).

28954781 is a wasteful number, since it uses less digits than its factorization.

28954781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316.

The product of its digits is 161280, while the sum is 44.

The square root of 28954781 is about 5380.9646904621. The cubic root of 28954781 is about 307.0719131827.

The spelling of 28954781 in words is "twenty-eight million, nine hundred fifty-four thousand, seven hundred eighty-one".