64489451 has 4 divisors (see below), whose sum is σ = 69450192. Its totient is φ = 59528712.

The previous prime is 64489429. The next prime is 64489463. The reversal of 64489451 is 15498446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64489451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64489399 and 64489408.

It is not an unprimeable number, because it can be changed into a prime (64489471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2480351 + ... + 2480376.

It is an arithmetic number, because the mean of its divisors is an integer number (17362548).

Almost surely, 2^64489451 is an apocalyptic number.

64489451 is a deficient number, since it is larger than the sum of its proper divisors (4960741).

64489451 is a wasteful number, since it uses less digits than its factorization.

64489451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960740.

The product of its digits is 138240, while the sum is 41.

The square root of 64489451 is about 8030.5324231959. The cubic root of 64489451 is about 401.0171011544.

The spelling of 64489451 in words is "sixty-four million, four hundred eighty-nine thousand, four hundred fifty-one".