64987945 has 16 divisors (see below), whose sum is σ = 85924800. Its totient is φ = 46792000.

The previous prime is 64987931. The next prime is 64987987. The reversal of 64987945 is 54978946.

It is a happy number.

It is not a de Polignac number, because 64987945 - 2⁷ = 64987817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64987892 and 64987901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (5370300).

Almost surely, 2^64987945 is an apocalyptic number.

It is an amenable number.

64987945 is a deficient number, since it is larger than the sum of its proper divisors (20936855).

64987945 is a wasteful number, since it uses less digits than its factorization.

64987945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11816.

The product of its digits is 2177280, while the sum is 52.

The square root of 64987945 is about 8061.5100942689. The cubic root of 64987945 is about 402.0477179893.

The spelling of 64987945 in words is "sixty-four million, nine hundred eighty-seven thousand, nine hundred forty-five".