64493945 has 4 divisors (see below), whose sum is σ = 77392740. Its totient is φ = 51595152.

The previous prime is 64493927. The next prime is 64493969. The reversal of 64493945 is 54939446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54939446 = 2 ⋅27469723.

It can be written as a sum of positive squares in 2 ways, for example, as 12538681 + 51955264 = 3541^2 + 7208^2 .

It is a cyclic number.

It is not a de Polignac number, because 64493945 - 2¹² = 64489849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64493896 and 64493905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6449390 + ... + 6449399.

It is an arithmetic number, because the mean of its divisors is an integer number (19348185).

Almost surely, 2^64493945 is an apocalyptic number.

It is an amenable number.

64493945 is a deficient number, since it is larger than the sum of its proper divisors (12898795).

64493945 is a wasteful number, since it uses less digits than its factorization.

64493945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12898794.

The product of its digits is 466560, while the sum is 44.

The square root of 64493945 is about 8030.8122254228. The cubic root of 64493945 is about 401.0264160060.

The spelling of 64493945 in words is "sixty-four million, four hundred ninety-three thousand, nine hundred forty-five".