28738973 has 4 divisors (see below), whose sum is σ = 29515740. Its totient is φ = 27962208.

The previous prime is 28738961. The next prime is 28738981. The reversal of 28738973 is 37983782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37983782 = 2 ⋅18991891.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 7606564 = 4597^2 + 2758^2 .

It is a cyclic number.

It is not a de Polignac number, because 28738973 - 2¹⁰ = 28737949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388328 + ... + 388401.

It is an arithmetic number, because the mean of its divisors is an integer number (7378935).

Almost surely, 2^28738973 is an apocalyptic number.

It is an amenable number.

28738973 is a deficient number, since it is larger than the sum of its proper divisors (776767).

28738973 is an equidigital number, since it uses as much as digits as its factorization.

28738973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776766.

The product of its digits is 508032, while the sum is 47.

The square root of 28738973 is about 5360.8742757129. The cubic root of 28738973 is about 306.3071126026.

The spelling of 28738973 in words is "twenty-eight million, seven hundred thirty-eight thousand, nine hundred seventy-three".