28207166401 has 4 divisors (see below), whose sum is σ = 28208385072. Its totient is φ = 28205947732.

The previous prime is 28207166389. The next prime is 28207166423. The reversal of 28207166401 is 10466170282.

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 28207166401 - 2¹¹ = 28207164353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28207166431) 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, 573931 + ... + 621136.

It is an arithmetic number, because the mean of its divisors is an integer number (7052096268).

Almost surely, 2^28207166401 is an apocalyptic number.

It is an amenable number.

28207166401 is a deficient number, since it is larger than the sum of its proper divisors (1218671).

28207166401 is a wasteful number, since it uses less digits than its factorization.

28207166401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218670.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 28207166401 in words is "twenty-eight billion, two hundred seven million, one hundred sixty-six thousand, four hundred one".