64493947 has 8 divisors (see below), whose sum is σ = 75212000. Its totient is φ = 55280232.

The previous prime is 64493927. The next prime is 64493969. The reversal of 64493947 is 74939446.

It is not a de Polignac number, because 64493947 - 2¹¹ = 64491899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64493897 and 64493906.

It is not an unprimeable number, because it can be changed into a prime (64493927) 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, 93672 + ... + 94357.

It is an arithmetic number, because the mean of its divisors is an integer number (9401500).

Almost surely, 2^64493947 is an apocalyptic number.

64493947 is a deficient number, since it is larger than the sum of its proper divisors (10718053).

64493947 is an equidigital number, since it uses as much as digits as its factorization.

64493947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188050 (or 188036 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 64493947 is about 8030.8123499432. The cubic root of 64493947 is about 401.0264201513.

The spelling of 64493947 in words is "sixty-four million, four hundred ninety-three thousand, nine hundred forty-seven".