640360369 has 16 divisors (see below), whose sum is σ = 759666816. Its totient is φ = 533088000.

The previous prime is 640360367. The next prime is 640360379. The reversal of 640360369 is 963063046.

It is a cyclic number.

It is not a de Polignac number, because 640360369 - 2¹ = 640360367 is a prime.

It is a super-2 number, since 2×640360369² = 820122804371632322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640360367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39357 + ... + 53194.

It is an arithmetic number, because the mean of its divisors is an integer number (47479176).

Almost surely, 2^640360369 is an apocalyptic number.

It is an amenable number.

640360369 is a deficient number, since it is larger than the sum of its proper divisors (119306447).

640360369 is a wasteful number, since it uses less digits than its factorization.

640360369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92616.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 640360369 is about 25305.3426967508. The cubic root of 640360369 is about 861.9355938873.

The spelling of 640360369 in words is "six hundred forty million, three hundred sixty thousand, three hundred sixty-nine".