764621866 has 4 divisors (see below), whose sum is σ = 1146932802. Its totient is φ = 382310932.

The previous prime is 764621863. The next prime is 764621941. The reversal of 764621866 is 668126467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668126467 = 2287 ⋅292141.

It can be written as a sum of positive squares in only one way, i.e., 606390625 + 158231241 = 24625^2 + 12579^2 .

It is not an unprimeable number, because it can be changed into a prime (764621863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191155465 + ... + 191155468.

Almost surely, 2^764621866 is an apocalyptic number.

764621866 is a deficient number, since it is larger than the sum of its proper divisors (382310936).

764621866 is a wasteful number, since it uses less digits than its factorization.

764621866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382310935.

The product of its digits is 580608, while the sum is 46.

The square root of 764621866 is about 27651.7967951452. The cubic root of 764621866 is about 914.4267128597.

The spelling of 764621866 in words is "seven hundred sixty-four million, six hundred twenty-one thousand, eight hundred sixty-six".