7640220 has 48 divisors (see below), whose sum is σ = 24450048. Its totient is φ = 1746240.

The previous prime is 7640219. The next prime is 7640221. The reversal of 7640220 is 220467.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7640219) and next prime (7640221).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8676 + ... + 9515.

It is an arithmetic number, because the mean of its divisors is an integer number (509376).

Almost surely, 2^7640220 is an apocalyptic number.

7640220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7640220 is an abundant number, since it is smaller than the sum of its proper divisors (16809828).

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

7640220 is a wasteful number, since it uses less digits than its factorization.

7640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18210 (or 18208 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 7640220 is about 2764.0947885339. The cubic root of 7640220 is about 196.9557305595.

Adding to 7640220 its reverse (220467), we get a palindrome (7860687).

The spelling of 7640220 in words is "seven million, six hundred forty thousand, two hundred twenty".