28015379 has 4 divisors (see below), whose sum is σ = 32017584. Its totient is φ = 24013176.

The previous prime is 28015373. The next prime is 28015381. The reversal of 28015379 is 97351082.

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 28015379 - 2⁸ = 28015123 is a prime.

It is a super-2 number, since 2×28015379² = 1569722921027282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28015373) 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, 2001092 + ... + 2001105.

It is an arithmetic number, because the mean of its divisors is an integer number (8004396).

Almost surely, 2^28015379 is an apocalyptic number.

28015379 is a deficient number, since it is larger than the sum of its proper divisors (4002205).

28015379 is an equidigital number, since it uses as much as digits as its factorization.

28015379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002204.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28015379 is about 5292.9556015519. The cubic root of 28015379 is about 303.7144818953.

The spelling of 28015379 in words is "twenty-eight million, fifteen thousand, three hundred seventy-nine".