766613820 has 72 divisors (see below), whose sum is σ = 2496980304. Its totient is φ = 175225344.

The previous prime is 766613789. The next prime is 766613821. The reversal of 766613820 is 28316667.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766613821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127437 + ... + 133316.

It is an arithmetic number, because the mean of its divisors is an integer number (34680282).

Almost surely, 2^766613820 is an apocalyptic number.

766613820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

766613820 is an abundant number, since it is smaller than the sum of its proper divisors (1730366484).

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

766613820 is a wasteful number, since it uses less digits than its factorization.

766613820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260779 (or 260770 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 766613820 is about 27687.7918946239. The cubic root of 766613820 is about 915.2200969529.

The spelling of 766613820 in words is "seven hundred sixty-six million, six hundred thirteen thousand, eight hundred twenty".