28457646 has 16 divisors (see below), whose sum is σ = 65046144. Its totient is φ = 8130744.

The previous prime is 28457641. The next prime is 28457669. The reversal of 28457646 is 64675482.

It is a super-2 number, since 2×28457646² = 1619675231722632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 677563 = 28457646 / (2 + 8 + 4 + 5 + 7 + 6 + 4 + 6).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28457598 and 28457607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338740 + ... + 338823.

It is an arithmetic number, because the mean of its divisors is an integer number (4065384).

Almost surely, 2^28457646 is an apocalyptic number.

28457646 is an abundant number, since it is smaller than the sum of its proper divisors (36588498).

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

28457646 is a wasteful number, since it uses less digits than its factorization.

28457646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677575.

The product of its digits is 322560, while the sum is 42.

The square root of 28457646 is about 5334.5708355968. The cubic root of 28457646 is about 305.3043490705.

The spelling of 28457646 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred forty-six".