646612386 has 32 divisors (see below), whose sum is σ = 1542233088. Its totient is φ = 176713680.

The previous prime is 646612381. The next prime is 646612387. The reversal of 646612386 is 683216646.

It is a super-2 number, since 2×646612386² = 836215155457225992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (646612381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333720 + ... + 335651.

It is an arithmetic number, because the mean of its divisors is an integer number (48194784).

Almost surely, 2^646612386 is an apocalyptic number.

646612386 is an abundant number, since it is smaller than the sum of its proper divisors (895620702).

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

646612386 is a wasteful number, since it uses less digits than its factorization.

646612386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669406.

The product of its digits is 248832, while the sum is 42.

The square root of 646612386 is about 25428.5742030496. The cubic root of 646612386 is about 864.7316199927.

The spelling of 646612386 in words is "six hundred forty-six million, six hundred twelve thousand, three hundred eighty-six".