64213391 has 8 divisors (see below), whose sum is σ = 70257024. Its totient is φ = 58204120.

The previous prime is 64213381. The next prime is 64213427. The reversal of 64213391 is 19331246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64213391 - 2¹⁰ = 64212367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64213381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4595 + ... + 12228.

It is an arithmetic number, because the mean of its divisors is an integer number (8782128).

Almost surely, 2^64213391 is an apocalyptic number.

64213391 is a deficient number, since it is larger than the sum of its proper divisors (6043633).

64213391 is a wasteful number, since it uses less digits than its factorization.

64213391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17181.

The product of its digits is 3888, while the sum is 29.

The square root of 64213391 is about 8013.3258388761. The cubic root of 64213391 is about 400.4440714024. Note that the first 3 decimals are identical.

The spelling of 64213391 in words is "sixty-four million, two hundred thirteen thousand, three hundred ninety-one".