28997406 has 16 divisors (see below), whose sum is σ = 64438800. Its totient is φ = 9665784.

The previous prime is 28997383. The next prime is 28997417. The reversal of 28997406 is 60479982.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268441 + ... + 268548.

It is an arithmetic number, because the mean of its divisors is an integer number (4027425).

Almost surely, 2^28997406 is an apocalyptic number.

28997406 is an abundant number, since it is smaller than the sum of its proper divisors (35441394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28997406 is a wasteful number, since it uses less digits than its factorization.

28997406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537000 (or 536994 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 28997406 is about 5384.9239548948. The cubic root of 28997406 is about 307.2225218473. Note that the first 3 decimals are identical.

It can be divided in two parts, 28997 and 406, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28997406 in words is "twenty-eight million, nine hundred ninety-seven thousand, four hundred six".