646615102 has 32 divisors (see below), whose sum is σ = 1130135040. Its totient is φ = 271732320.

The previous prime is 646615091. The next prime is 646615103. The reversal of 646615102 is 201516646.

It is a super-2 number, since 2×646615102² = 836222180268940808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646615103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446143 + ... + 447589.

It is an arithmetic number, because the mean of its divisors is an integer number (35316720).

Almost surely, 2^646615102 is an apocalyptic number.

646615102 is a deficient number, since it is larger than the sum of its proper divisors (483519938).

646615102 is a wasteful number, since it uses less digits than its factorization.

646615102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 646615102 is about 25428.6276074821. The cubic root of 646615102 is about 864.7328307169.

It can be divided in two parts, 64 and 6615102, that added together give a palindrome (6615166).

The spelling of 646615102 in words is "six hundred forty-six million, six hundred fifteen thousand, one hundred two".