28964640 has 48 divisors (see below), whose sum is σ = 91240128. Its totient is φ = 7723776.

The previous prime is 28964629. The next prime is 28964653. The reversal of 28964640 is 4646982.

It is a tau number, because it is divible by the number of its divisors (48).

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, 29692 + ... + 30651.

It is an arithmetic number, because the mean of its divisors is an integer number (1900836).

Almost surely, 2^28964640 is an apocalyptic number.

28964640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28964640 is an abundant number, since it is smaller than the sum of its proper divisors (62275488).

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

28964640 is a wasteful number, since it uses less digits than its factorization.

28964640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60361 (or 60353 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 28964640 is about 5381.8807121674. The cubic root of 28964640 is about 307.1067615260.

The spelling of 28964640 in words is "twenty-eight million, nine hundred sixty-four thousand, six hundred forty".