64216940 has 12 divisors (see below), whose sum is σ = 134855616. Its totient is φ = 25686768.

The previous prime is 64216937. The next prime is 64216949. The reversal of 64216940 is 4961246.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64216897 and 64216906.

It is not an unprimeable number, because it can be changed into a prime (64216949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1605404 + ... + 1605443.

It is an arithmetic number, because the mean of its divisors is an integer number (11237968).

Almost surely, 2^64216940 is an apocalyptic number.

It is an amenable number.

64216940 is an abundant number, since it is smaller than the sum of its proper divisors (70638676).

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

64216940 is a wasteful number, since it uses less digits than its factorization.

64216940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210856 (or 3210854 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 64216940 is about 8013.5472794512. The cubic root of 64216940 is about 400.4514486270.

It can be divided in two parts, 64216 and 940, that added together give a palindrome (65156).

The spelling of 64216940 in words is "sixty-four million, two hundred sixteen thousand, nine hundred forty".