766398440 has 32 divisors (see below), whose sum is σ = 1815156000. Its totient is φ = 290424384.

The previous prime is 766398439. The next prime is 766398443. The reversal of 766398440 is 44893667.

It is not an unprimeable number, because it can be changed into a prime (766398443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503450 + ... + 504969.

It is an arithmetic number, because the mean of its divisors is an integer number (56723625).

Almost surely, 2^766398440 is an apocalyptic number.

It is an amenable number.

766398440 is an abundant number, since it is smaller than the sum of its proper divisors (1048757560).

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

766398440 is a wasteful number, since it uses less digits than its factorization.

766398440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008449 (or 1008445 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 766398440 is about 27683.9021815928. The cubic root of 766398440 is about 915.1343786236.

The spelling of 766398440 in words is "seven hundred sixty-six million, three hundred ninety-eight thousand, four hundred forty".