28779953 has 4 divisors (see below), whose sum is σ = 28860480. Its totient is φ = 28699428.

The previous prime is 28779941. The next prime is 28779973. The reversal of 28779953 is 35997782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28779953 - 2⁸ = 28779697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28779913) 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, 39725 + ... + 40442.

It is an arithmetic number, because the mean of its divisors is an integer number (7215120).

Almost surely, 2^28779953 is an apocalyptic number.

It is an amenable number.

28779953 is a deficient number, since it is larger than the sum of its proper divisors (80527).

28779953 is an equidigital number, since it uses as much as digits as its factorization.

28779953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80526.

The product of its digits is 952560, while the sum is 50.

The square root of 28779953 is about 5364.6950519112. The cubic root of 28779953 is about 306.4526351287.

The spelling of 28779953 in words is "twenty-eight million, seven hundred seventy-nine thousand, nine hundred fifty-three".