3646651872 has 24 divisors (see below), whose sum is σ = 9572461416. Its totient is φ = 1215550592.

The previous prime is 3646651849. The next prime is 3646651891. The reversal of 3646651872 is 2781566463.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×3646651872² = 26596139751122208768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18992883 + ... + 18993074.

It is an arithmetic number, because the mean of its divisors is an integer number (398852559).

Almost surely, 2^3646651872 is an apocalyptic number.

3646651872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3646651872 is an abundant number, since it is smaller than the sum of its proper divisors (5925809544).

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

3646651872 is a wasteful number, since it uses less digits than its factorization.

3646651872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37985970 (or 37985962 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 3646651872 is about 60387.5142061668. The cubic root of 3646651872 is about 1539.2107993171.

The spelling of 3646651872 in words is "three billion, six hundred forty-six million, six hundred fifty-one thousand, eight hundred seventy-two".