28400946 has 32 divisors (see below), whose sum is σ = 66503808. Its totient is φ = 7916160.

The previous prime is 28400927. The next prime is 28400959. The reversal of 28400946 is 64900482.

It is a super-2 number, since 2×28400946² = 1613227467389832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6525 + ... + 9968.

It is an arithmetic number, because the mean of its divisors is an integer number (2078244).

Almost surely, 2^28400946 is an apocalyptic number.

28400946 is an abundant number, since it is smaller than the sum of its proper divisors (38102862).

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

28400946 is a wasteful number, since it uses less digits than its factorization.

28400946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16546.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28400946 is about 5329.2537939190. The cubic root of 28400946 is about 305.1014479336.

The spelling of 28400946 in words is "twenty-eight million, four hundred thousand, nine hundred forty-six".