28172963 has 16 divisors (see below), whose sum is σ = 35157696. Its totient is φ = 21980160.

The previous prime is 28172959. The next prime is 28172983. The reversal of 28172963 is 36927182.

28172963 = T₄₂ + T₄₃ + ... + T₅₅₂.

It is a cyclic number.

It is not a de Polignac number, because 28172963 - 2² = 28172959 is a prime.

It is a super-3 number, since 3×28172963³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28172923) 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, 4523 + ... + 8763.

It is an arithmetic number, because the mean of its divisors is an integer number (2197356).

Almost surely, 2^28172963 is an apocalyptic number.

28172963 is a deficient number, since it is larger than the sum of its proper divisors (6984733).

28172963 is a wasteful number, since it uses less digits than its factorization.

28172963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334.

The product of its digits is 36288, while the sum is 38.

The square root of 28172963 is about 5307.8209276501. The cubic root of 28172963 is about 304.2828731017.

The spelling of 28172963 in words is "twenty-eight million, one hundred seventy-two thousand, nine hundred sixty-three".