766640 has 60 divisors (see below), whose sum is σ = 2093616. Its totient is φ = 255744.

The previous prime is 766639. The next prime is 766651. The reversal of 766640 is 46667.

766640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20702 + ... + 20738.

2⁷⁶⁶⁶⁴⁰ is an apocalyptic number.

766640 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 766640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046808).

766640 is an abundant number, since it is smaller than the sum of its proper divisors (1326976).

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

766640 is a wasteful number, since it uses less digits than its factorization.

766640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 766640 is about 875.5798078987. The cubic root of 766640 is about 91.5230515145.

The spelling of 766640 in words is "seven hundred sixty-six thousand, six hundred forty".