28957646 has 8 divisors (see below), whose sum is σ = 43461480. Its totient is φ = 14470488.

The previous prime is 28957639. The next prime is 28957657. The reversal of 28957646 is 64675982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28957646² = 1677090523722632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28957646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (5432685).

Almost surely, 2^28957646 is an apocalyptic number.

28957646 is a deficient number, since it is larger than the sum of its proper divisors (14503834).

28957646 is a wasteful number, since it uses less digits than its factorization.

28957646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338.

The product of its digits is 725760, while the sum is 47.

The square root of 28957646 is about 5381.2309000822. The cubic root of 28957646 is about 307.0820408368.

The spelling of 28957646 in words is "twenty-eight million, nine hundred fifty-seven thousand, six hundred forty-six".