28738997 has 4 divisors (see below), whose sum is σ = 32844576. Its totient is φ = 24633420.

The previous prime is 28738981. The next prime is 28739003. The reversal of 28738997 is 79983782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28738997 - 2⁴ = 28738981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28738097) 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, 2052779 + ... + 2052792.

It is an arithmetic number, because the mean of its divisors is an integer number (8211144).

Almost surely, 2^28738997 is an apocalyptic number.

It is an amenable number.

28738997 is a deficient number, since it is larger than the sum of its proper divisors (4105579).

28738997 is an equidigital number, since it uses as much as digits as its factorization.

28738997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105578.

The product of its digits is 1524096, while the sum is 53.

The square root of 28738997 is about 5360.8765141533. The cubic root of 28738997 is about 306.3071978686.

The spelling of 28738997 in words is "twenty-eight million, seven hundred thirty-eight thousand, nine hundred ninety-seven".