28167951 has 16 divisors (see below), whose sum is σ = 42997248. Its totient is φ = 16068000.

The previous prime is 28167947. The next prime is 28168009. The reversal of 28167951 is 15976182.

It is not a de Polignac number, because 28167951 - 2² = 28167947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28167911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21001 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (2687328).

Almost surely, 2^28167951 is an apocalyptic number.

28167951 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28167951 is a deficient number, since it is larger than the sum of its proper divisors (14829297).

28167951 is a wasteful number, since it uses less digits than its factorization.

28167951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342.

The product of its digits is 30240, while the sum is 39.

The square root of 28167951 is about 5307.3487731635. The cubic root of 28167951 is about 304.2648279496.

The spelling of 28167951 in words is "twenty-eight million, one hundred sixty-seven thousand, nine hundred fifty-one".