28746497 has 4 divisors (see below), whose sum is σ = 30957780. Its totient is φ = 26535216.

The previous prime is 28746493. The next prime is 28746499. The reversal of 28746497 is 79464782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19722481 + 9024016 = 4441^2 + 3004^2 .

It is a cyclic number.

It is not a de Polignac number, because 28746497 - 2² = 28746493 is a prime.

It is a super-2 number, since 2×28746497² = 1652722179542018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28746493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1105622 + ... + 1105647.

It is an arithmetic number, because the mean of its divisors is an integer number (7739445).

Almost surely, 2^28746497 is an apocalyptic number.

It is an amenable number.

28746497 is a deficient number, since it is larger than the sum of its proper divisors (2211283).

28746497 is a wasteful number, since it uses less digits than its factorization.

28746497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211282.

The product of its digits is 677376, while the sum is 47.

The square root of 28746497 is about 5361.5759809966. The cubic root of 28746497 is about 306.3338411571. Note that the first 3 decimals are identical.

The spelling of 28746497 in words is "twenty-eight million, seven hundred forty-six thousand, four hundred ninety-seven".