766649994 has 64 divisors (see below), whose sum is σ = 1725898752. Its totient is φ = 225032000.

The previous prime is 766649987. The next prime is 766649999. The reversal of 766649994 is 499946667.

It is a super-3 number, since 3×766649994³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (766649999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312079 + ... + 314525.

It is an arithmetic number, because the mean of its divisors is an integer number (26967168).

Almost surely, 2^766649994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 766649994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862949376).

766649994 is an abundant number, since it is smaller than the sum of its proper divisors (959248758).

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

766649994 is a wasteful number, since it uses less digits than its factorization.

766649994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611.

The product of its digits is 17635968, while the sum is 60.

The square root of 766649994 is about 27688.4451351101. The cubic root of 766649994 is about 915.2344921413.

The spelling of 766649994 in words is "seven hundred sixty-six million, six hundred forty-nine thousand, nine hundred ninety-four".