64213680 has 40 divisors (see below), whose sum is σ = 199063152. Its totient is φ = 17123584.

The previous prime is 64213637. The next prime is 64213693. The reversal of 64213680 is 8631246.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133539 + ... + 134018.

Almost surely, 2^64213680 is an apocalyptic number.

64213680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64213680 is an abundant number, since it is smaller than the sum of its proper divisors (134849472).

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

64213680 is a wasteful number, since it uses less digits than its factorization.

64213680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267573 (or 267567 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 64213680 is about 8013.3438713186. The cubic root of 64213680 is about 400.4446721502. Note that the first 3 decimals are identical.

It can be divided in two parts, 6421 and 3680, that added together give a palindrome (10101).

The spelling of 64213680 in words is "sixty-four million, two hundred thirteen thousand, six hundred eighty".