64091397 has 8 divisors (see below), whose sum is σ = 85502560. Its totient is φ = 42703920.

The previous prime is 64091393. The next prime is 64091399. The reversal of 64091397 is 79319046.

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

It is not a de Polignac number, because 64091397 - 2² = 64091393 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 (64091393) 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, 1854 + ... + 11472.

It is an arithmetic number, because the mean of its divisors is an integer number (10687820).

Almost surely, 2^64091397 is an apocalyptic number.

It is an amenable number.

64091397 is a deficient number, since it is larger than the sum of its proper divisors (21411163).

64091397 is a wasteful number, since it uses less digits than its factorization.

64091397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11843.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 64091397 is about 8005.7102745478. The cubic root of 64091397 is about 400.1903198482.

The spelling of 64091397 in words is "sixty-four million, ninety-one thousand, three hundred ninety-seven".