28207977 has 32 divisors (see below), whose sum is σ = 44544000. Its totient is φ = 15868944.

The previous prime is 28207973. The next prime is 28207979. The reversal of 28207977 is 77970282.

It is not a de Polignac number, because 28207977 - 2² = 28207973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28207973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81118 + ... + 81464.

It is an arithmetic number, because the mean of its divisors is an integer number (1392000).

Almost surely, 2^28207977 is an apocalyptic number.

It is an amenable number.

28207977 is a deficient number, since it is larger than the sum of its proper divisors (16336023).

28207977 is an equidigital number, since it uses as much as digits as its factorization.

28207977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 28207977 is about 5311.1182438353. The cubic root of 28207977 is about 304.4088774771.

The spelling of 28207977 in words is "twenty-eight million, two hundred seven thousand, nine hundred seventy-seven".