64678473 has 8 divisors (see below), whose sum is σ = 95820000. Its totient is φ = 43118964.

The previous prime is 64678469. The next prime is 64678477. The reversal of 64678473 is 37487646.

It is an interprime number because it is at equal distance from previous prime (64678469) and next prime (64678477).

It is not a de Polignac number, because 64678473 - 2² = 64678469 is a prime.

It is a super-2 number, since 2×64678473² = 8366609739223458, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64678477) 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, 1197723 + ... + 1197776.

It is an arithmetic number, because the mean of its divisors is an integer number (11977500).

Almost surely, 2^64678473 is an apocalyptic number.

It is an amenable number.

64678473 is a deficient number, since it is larger than the sum of its proper divisors (31141527).

64678473 is a wasteful number, since it uses less digits than its factorization.

64678473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395508 (or 2395502 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 64678473 is about 8042.2927700998. The cubic root of 64678473 is about 401.4085197751.

The spelling of 64678473 in words is "sixty-four million, six hundred seventy-eight thousand, four hundred seventy-three".