766447740 has 36 divisors (see below), whose sum is σ = 2324892024. Its totient is φ = 204386016.

The previous prime is 766447729. The next prime is 766447777. The reversal of 766447740 is 47744667.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×766447740² = 1174884276302215200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 2128842 + ... + 2129201.

It is an arithmetic number, because the mean of its divisors is an integer number (64580334).

Almost surely, 2^766447740 is an apocalyptic number.

It is an amenable number.

766447740 is an abundant number, since it is smaller than the sum of its proper divisors (1558444284).

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

766447740 is a wasteful number, since it uses less digits than its factorization.

766447740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258058 (or 4258053 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 45.

The square root of 766447740 is about 27684.7925764308. The cubic root of 766447740 is about 915.1540007745.

The spelling of 766447740 in words is "seven hundred sixty-six million, four hundred forty-seven thousand, seven hundred forty".