64693231 has 8 divisors (see below), whose sum is σ = 66089520. Its totient is φ = 63303552.

The previous prime is 64693217. The next prime is 64693243. The reversal of 64693231 is 13239646.

It is a happy number.

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 64693231 - 2¹¹ = 64691183 is a prime.

It is a super-2 number, since 2×64693231² = 8370428274438722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64696231) 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, 21540 + ... + 24358.

It is an arithmetic number, because the mean of its divisors is an integer number (8261190).

Almost surely, 2^64693231 is an apocalyptic number.

64693231 is a deficient number, since it is larger than the sum of its proper divisors (1396289).

64693231 is a wasteful number, since it uses less digits than its factorization.

64693231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305.

The product of its digits is 23328, while the sum is 34.

The square root of 64693231 is about 8043.2102421856. The cubic root of 64693231 is about 401.4390478944.

The spelling of 64693231 in words is "sixty-four million, six hundred ninety-three thousand, two hundred thirty-one".