64672945 has 4 divisors (see below), whose sum is σ = 77607540. Its totient is φ = 51738352.

The previous prime is 64672943. The next prime is 64672957. The reversal of 64672945 is 54927646.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 37173409 = 5244^2 + 6097^2 .

It is a cyclic number.

It is not a de Polignac number, because 64672945 - 2¹ = 64672943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64672943) 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, 6467290 + ... + 6467299.

It is an arithmetic number, because the mean of its divisors is an integer number (19401885).

Almost surely, 2^64672945 is an apocalyptic number.

It is an amenable number.

64672945 is a deficient number, since it is larger than the sum of its proper divisors (12934595).

64672945 is a wasteful number, since it uses less digits than its factorization.

64672945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12934594.

The product of its digits is 362880, while the sum is 43.

The square root of 64672945 is about 8041.9490796697. The cubic root of 64672945 is about 401.3970834635.

The spelling of 64672945 in words is "sixty-four million, six hundred seventy-two thousand, nine hundred forty-five".