64958809 has 4 divisors (see below), whose sum is σ = 65091600. Its totient is φ = 64826020.

The previous prime is 64958807. The next prime is 64958813. The reversal of 64958809 is 90885946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90885946 = 2 ⋅45442973.

It is a cyclic number.

It is not a de Polignac number, because 64958809 - 2¹ = 64958807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64958807) 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, 65659 + ... + 66640.

It is an arithmetic number, because the mean of its divisors is an integer number (16272900).

Almost surely, 2^64958809 is an apocalyptic number.

It is an amenable number.

64958809 is a deficient number, since it is larger than the sum of its proper divisors (132791).

64958809 is a wasteful number, since it uses less digits than its factorization.

64958809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132790.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 64958809 is about 8059.7027860834. The cubic root of 64958809 is about 401.9876257505.

The spelling of 64958809 in words is "sixty-four million, nine hundred fifty-eight thousand, eight hundred nine".