64549997 has 8 divisors (see below), whose sum is σ = 65797056. Its totient is φ = 63315072.

The previous prime is 64549957. The next prime is 64549999. The reversal of 64549997 is 79994546.

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 64549997 - 2⁸ = 64549741 is a prime.

It is a super-2 number, since 2×64549997² = 8333404225400018, 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 (64549999) 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, 8093 + ... + 13949.

It is an arithmetic number, because the mean of its divisors is an integer number (8224632).

Almost surely, 2^64549997 is an apocalyptic number.

It is an amenable number.

64549997 is a deficient number, since it is larger than the sum of its proper divisors (1247059).

64549997 is a wasteful number, since it uses less digits than its factorization.

64549997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6067.

The product of its digits is 2449440, while the sum is 53.

The square root of 64549997 is about 8034.3012764023. The cubic root of 64549997 is about 401.1425603655.

The spelling of 64549997 in words is "sixty-four million, five hundred forty-nine thousand, nine hundred ninety-seven".