28994637 has 16 divisors (see below), whose sum is σ = 44311040. Its totient is φ = 16520112.

The previous prime is 28994621. The next prime is 28994653. The reversal of 28994637 is 73649982.

It is an interprime number because it is at equal distance from previous prime (28994621) and next prime (28994653).

It is not a de Polignac number, because 28994637 - 2⁴ = 28994621 is a prime.

It is a Duffinian number.

Its product of digits (653184) is a multiple of the sum of its prime divisors (4032).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28994617) 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, 6138 + ... + 9780.

It is an arithmetic number, because the mean of its divisors is an integer number (2769440).

Almost surely, 2^28994637 is an apocalyptic number.

It is an amenable number.

28994637 is a deficient number, since it is larger than the sum of its proper divisors (15316403).

28994637 is a wasteful number, since it uses less digits than its factorization.

28994637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032.

The product of its digits is 653184, while the sum is 48.

The square root of 28994637 is about 5384.6668420618. Note that the first 3 decimals coincide. The cubic root of 28994637 is about 307.2127425100.

The spelling of 28994637 in words is "twenty-eight million, nine hundred ninety-four thousand, six hundred thirty-seven".