28779151 has 4 divisors (see below), whose sum is σ = 28794672. Its totient is φ = 28763632.

The previous prime is 28779143. The next prime is 28779173. The reversal of 28779151 is 15197782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28779151 - 2³ = 28779143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28719151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4531 + ... + 8836.

It is an arithmetic number, because the mean of its divisors is an integer number (7198668).

Almost surely, 2^28779151 is an apocalyptic number.

28779151 is a deficient number, since it is larger than the sum of its proper divisors (15521).

28779151 is a wasteful number, since it uses less digits than its factorization.

28779151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15520.

The product of its digits is 35280, while the sum is 40.

The square root of 28779151 is about 5364.6203034325. The cubic root of 28779151 is about 306.4497885026.

The spelling of 28779151 in words is "twenty-eight million, seven hundred seventy-nine thousand, one hundred fifty-one".