7666440 has 64 divisors (see below), whose sum is σ = 23803200. Its totient is φ = 1972992.

The previous prime is 7666433. The next prime is 7666453. The reversal of 7666440 is 446667.

It is a nialpdrome in base 10.

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, 2379 + ... + 4581.

It is an arithmetic number, because the mean of its divisors is an integer number (371925).

Almost surely, 2^7666440 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 7666440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11901600).

7666440 is an abundant number, since it is smaller than the sum of its proper divisors (16136760).

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

7666440 is a wasteful number, since it uses less digits than its factorization.

7666440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2242 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 7666440 is about 2768.8336894801. The cubic root of 7666440 is about 197.1807800542.

The spelling of 7666440 in words is "seven million, six hundred sixty-six thousand, four hundred forty".