3644778645 has 24 divisors (see below), whose sum is σ = 6650124000. Its totient is φ = 1841571936.

The previous prime is 3644778637. The next prime is 3644778649. The reversal of 3644778645 is 5468774463.

It is not a de Polignac number, because 3644778645 - 2³ = 3644778637 is a prime.

It is a super-2 number, since 2×3644778645² = 26568822742096072050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3644778591 and 3644778600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644778649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2130595 + ... + 2132304.

It is an arithmetic number, because the mean of its divisors is an integer number (277088500).

Almost surely, 2^3644778645 is an apocalyptic number.

It is an amenable number.

3644778645 is a deficient number, since it is larger than the sum of its proper divisors (3005345355).

3644778645 is a wasteful number, since it uses less digits than its factorization.

3644778645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262929 (or 4262926 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 54.

The square root of 3644778645 is about 60372.0021615981. The cubic root of 3644778645 is about 1538.9471981499.

The spelling of 3644778645 in words is "three billion, six hundred forty-four million, seven hundred seventy-eight thousand, six hundred forty-five".