767640220 has 12 divisors (see below), whose sum is σ = 1612044504. Its totient is φ = 307056080.

The previous prime is 767640199. The next prime is 767640227. The reversal of 767640220 is 22046767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (767640227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19190986 + ... + 19191025.

It is an arithmetic number, because the mean of its divisors is an integer number (134337042).

Almost surely, 2^767640220 is an apocalyptic number.

It is an amenable number.

767640220 is an abundant number, since it is smaller than the sum of its proper divisors (844404284).

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

767640220 is a wasteful number, since it uses less digits than its factorization.

767640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38382020 (or 38382018 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 767640220 is about 27706.3209394535. The cubic root of 767640220 is about 915.6283698696.

Adding to 767640220 its reverse (22046767), we get a palindrome (789686987).

The spelling of 767640220 in words is "seven hundred sixty-seven million, six hundred forty thousand, two hundred twenty".