28997390 has 16 divisors (see below), whose sum is σ = 53995680. Its totient is φ = 11198880.

The previous prime is 28997383. The next prime is 28997417. The reversal of 28997390 is 9379982.

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, 49706 + ... + 50285.

It is an arithmetic number, because the mean of its divisors is an integer number (3374730).

Almost surely, 2^28997390 is an apocalyptic number.

28997390 is a deficient number, since it is larger than the sum of its proper divisors (24998290).

28997390 is a wasteful number, since it uses less digits than its factorization.

28997390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100027.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 28997390 is about 5384.9224692655. The cubic root of 28997390 is about 307.2224653416. Note that the first 3 decimals are identical.

It can be divided in two parts, 289 and 97390, that added together give a palindrome (97679).

The spelling of 28997390 in words is "twenty-eight million, nine hundred ninety-seven thousand, three hundred ninety".