64629866 has 16 divisors (see below), whose sum is σ = 112611840. Its totient is φ = 27244080.

The previous prime is 64629863. The next prime is 64629881. The reversal of 64629866 is 66892646.

It is a self number, because there is not a number n which added to its sum of digits gives 64629866.

It is not an unprimeable number, because it can be changed into a prime (64629863) 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, 36986 + ... + 38693.

It is an arithmetic number, because the mean of its divisors is an integer number (7038240).

Almost surely, 2^64629866 is an apocalyptic number.

64629866 is a deficient number, since it is larger than the sum of its proper divisors (47981974).

64629866 is a wasteful number, since it uses less digits than its factorization.

64629866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75749.

The product of its digits is 746496, while the sum is 47.

The square root of 64629866 is about 8039.2702405131. The cubic root of 64629866 is about 401.3079394081.

The spelling of 64629866 in words is "sixty-four million, six hundred twenty-nine thousand, eight hundred sixty-six".