64491493 has 8 divisors (see below), whose sum is σ = 71038656. Its totient is φ = 58058400.

The previous prime is 64491463. The next prime is 64491503. The reversal of 64491493 is 39419446.

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 64491493 - 2⁵ = 64491461 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 (64491403) 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, 27328 + ... + 29593.

It is an arithmetic number, because the mean of its divisors is an integer number (8879832).

Almost surely, 2^64491493 is an apocalyptic number.

It is an amenable number.

64491493 is a deficient number, since it is larger than the sum of its proper divisors (6547163).

64491493 is a wasteful number, since it uses less digits than its factorization.

64491493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57035.

The product of its digits is 93312, while the sum is 40.

The square root of 64491493 is about 8030.6595619538. The cubic root of 64491493 is about 401.0213337240.

The spelling of 64491493 in words is "sixty-four million, four hundred ninety-one thousand, four hundred ninety-three".