3665606400 has 324 divisors, whose sum is σ = 13596520392. Its totient is φ = 977080320.

The previous prime is 3665606323. The next prime is 3665606411. The reversal of 3665606400 is 46065663.

3665606400 is a `hidden beast` number, since 3 + 6 + 6 + 5 + 6 + 0 + 640 + 0 = 666.

3665606400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (324).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1554022 + ... + 1556378.

Almost surely, 2^3665606400 is an apocalyptic number.

3665606400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665606400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6798260196).

3665606400 is an abundant number, since it is smaller than the sum of its proper divisors (9930913992).

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

3665606400 is an equidigital number, since it uses as much as digits as its factorization.

3665606400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398 (or 2367 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 3665606400 is about 60544.2515851010. The cubic root of 3665606400 is about 1541.8730232011.

The spelling of 3665606400 in words is "three billion, six hundred sixty-five million, six hundred six thousand, four hundred".