7286640 has 80 divisors (see below), whose sum is σ = 22894368. Its totient is φ = 1916928.

The previous prime is 7286621. The next prime is 7286681. The reversal of 7286640 is 466827.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23124 + ... + 23436.

Almost surely, 2^7286640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7286640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11447184).

7286640 is an abundant number, since it is smaller than the sum of its proper divisors (15607728).

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

7286640 is a wasteful number, since it uses less digits than its factorization.

7286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 7286640 is about 2699.3777060649. The cubic root of 7286640 is about 193.8693278107.

The spelling of 7286640 in words is "seven million, two hundred eighty-six thousand, six hundred forty".