28054640 has 40 divisors (see below), whose sum is σ = 68663760. Its totient is φ = 10630656.

The previous prime is 28054633. The next prime is 28054679. The reversal of 28054640 is 4645082.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 7709 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (1716594).

Almost surely, 2^28054640 is an apocalyptic number.

28054640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28054640 is an abundant number, since it is smaller than the sum of its proper divisors (40609120).

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

28054640 is a wasteful number, since it uses less digits than its factorization.

28054640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18489 (or 18483 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28054640 is about 5296.6631004813. The cubic root of 28054640 is about 303.8562917254.

The spelling of 28054640 in words is "twenty-eight million, fifty-four thousand, six hundred forty".