28720167 has 32 divisors (see below), whose sum is σ = 45625344. Its totient is φ = 15724800.

The previous prime is 28720163. The next prime is 28720183. The reversal of 28720167 is 76102782.

It is not a de Polignac number, because 28720167 - 2² = 28720163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720163) 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, 102067 + ... + 102347.

It is an arithmetic number, because the mean of its divisors is an integer number (1425792).

Almost surely, 2^28720167 is an apocalyptic number.

28720167 is a deficient number, since it is larger than the sum of its proper divisors (16905177).

28720167 is a wasteful number, since it uses less digits than its factorization.

28720167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 28720167 is about 5359.1199837287. The cubic root of 28720167 is about 306.2402850174.

The spelling of 28720167 in words is "twenty-eight million, seven hundred twenty thousand, one hundred sixty-seven".