3665240280 has 320 divisors, whose sum is σ = 13370132160. Its totient is φ = 895214592.

The previous prime is 3665240263. The next prime is 3665240287. The reversal of 3665240280 is 820425663.

3665240280 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665240287) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7286509 + ... + 7287011.

It is an arithmetic number, because the mean of its divisors is an integer number (41781663).

Almost surely, 2^3665240280 is an apocalyptic number.

3665240280 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 3665240280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6685066080).

3665240280 is an abundant number, since it is smaller than the sum of its proper divisors (9704891880).

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

3665240280 is a wasteful number, since it uses less digits than its factorization.

3665240280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 3665240280 is about 60541.2279360107. The cubic root of 3665240280 is about 1541.8216875070.

The spelling of 3665240280 in words is "three billion, six hundred sixty-five million, two hundred forty thousand, two hundred eighty".