28724967 has 12 divisors (see below), whose sum is σ = 42076944. Its totient is φ = 18879840.

The previous prime is 28724963. The next prime is 28724981. The reversal of 28724967 is 76942782.

It is not a de Polignac number, because 28724967 - 2² = 28724963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21838 + ... + 23115.

It is an arithmetic number, because the mean of its divisors is an integer number (3506412).

Almost surely, 2^28724967 is an apocalyptic number.

28724967 is a deficient number, since it is larger than the sum of its proper divisors (13351977).

28724967 is a wasteful number, since it uses less digits than its factorization.

28724967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45030 (or 45027 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 28724967 is about 5359.5677997391. The cubic root of 28724967 is about 306.2573447079.

The spelling of 28724967 in words is "twenty-eight million, seven hundred twenty-four thousand, nine hundred sixty-seven".