28002997 has 4 divisors (see below), whose sum is σ = 30548736. Its totient is φ = 25457260.

The previous prime is 28002971. The next prime is 28003007. The reversal of 28002997 is 79920082.

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 a cyclic number.

It is not a de Polignac number, because 28002997 - 2¹¹ = 28000949 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 (28002907) 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, 1272853 + ... + 1272874.

It is an arithmetic number, because the mean of its divisors is an integer number (7637184).

Almost surely, 2^28002997 is an apocalyptic number.

It is an amenable number.

28002997 is a deficient number, since it is larger than the sum of its proper divisors (2545739).

28002997 is a wasteful number, since it uses less digits than its factorization.

28002997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545738.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 28002997 is about 5291.7858044331. The cubic root of 28002997 is about 303.6697309167.

It can be divided in two parts, 280029 and 97, that added together give a triangular number (280126 = T₇₄₈).

The spelling of 28002997 in words is "twenty-eight million, two thousand, nine hundred ninety-seven".