64919077 has 4 divisors (see below), whose sum is σ = 64939660. Its totient is φ = 64898496.

The previous prime is 64919059. The next prime is 64919123. The reversal of 64919077 is 77091946.

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 23561316 + 41357761 = 4854^2 + 6431^2 .

It is a cyclic number.

It is not a de Polignac number, because 64919077 - 2¹¹ = 64917029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64919027) 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, 4458 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (16234915).

Almost surely, 2^64919077 is an apocalyptic number.

It is an amenable number.

64919077 is a deficient number, since it is larger than the sum of its proper divisors (20583).

64919077 is a wasteful number, since it uses less digits than its factorization.

64919077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20582.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 64919077 is about 8057.2375539015. The cubic root of 64919077 is about 401.9056505723.

The spelling of 64919077 in words is "sixty-four million, nine hundred nineteen thousand, seventy-seven".