28939477 has 8 divisors (see below), whose sum is σ = 34214400. Its totient is φ = 23949744.

The previous prime is 28939459. The next prime is 28939499. The reversal of 28939477 is 77493982.

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

It is a de Polignac number, because none of the positive numbers 2^k-28939477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28939477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939577) 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, 71077 + ... + 71482.

It is an arithmetic number, because the mean of its divisors is an integer number (4276800).

Almost surely, 2^28939477 is an apocalyptic number.

It is an amenable number.

28939477 is a deficient number, since it is larger than the sum of its proper divisors (5274923).

28939477 is a wasteful number, since it uses less digits than its factorization.

28939477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142595.

The product of its digits is 762048, while the sum is 49.

The square root of 28939477 is about 5379.5424526627. The cubic root of 28939477 is about 307.0178028700.

The spelling of 28939477 in words is "twenty-eight million, nine hundred thirty-nine thousand, four hundred seventy-seven".