28976861 has 4 divisors (see below), whose sum is σ = 29034300. Its totient is φ = 28919424.

The previous prime is 28976851. The next prime is 28976867. The reversal of 28976861 is 16867982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9572836 + 19404025 = 3094^2 + 4405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28976861 - 2²² = 24782557 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 (28976867) 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, 27956 + ... + 28973.

It is an arithmetic number, because the mean of its divisors is an integer number (7258575).

Almost surely, 2^28976861 is an apocalyptic number.

It is an amenable number.

28976861 is a deficient number, since it is larger than the sum of its proper divisors (57439).

28976861 is an equidigital number, since it uses as much as digits as its factorization.

28976861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57438.

The product of its digits is 290304, while the sum is 47.

The square root of 28976861 is about 5383.0159761977. The cubic root of 28976861 is about 307.1499477927.

The spelling of 28976861 in words is "twenty-eight million, nine hundred seventy-six thousand, eight hundred sixty-one".