7666820 has 48 divisors (see below), whose sum is σ = 19208448. Its totient is φ = 2513280.

The previous prime is 7666819. The next prime is 7666849. The reversal of 7666820 is 286667.

7666820 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

7666820 is strictly pandigital in base 8.

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, 2030 + ... + 4410.

It is an arithmetic number, because the mean of its divisors is an integer number (400176).

Almost surely, 2^7666820 is an apocalyptic number.

7666820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7666820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9604224).

7666820 is an abundant number, since it is smaller than the sum of its proper divisors (11541628).

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

7666820 is a wasteful number, since it uses less digits than its factorization.

7666820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 7666820 is about 2768.9023095805. The cubic root of 7666820 is about 197.1840378661.

The spelling of 7666820 in words is "seven million, six hundred sixty-six thousand, eight hundred twenty".