64764869 has 4 divisors (see below), whose sum is σ = 69746796. Its totient is φ = 59782944.

The previous prime is 64764841. The next prime is 64764881. The reversal of 64764869 is 96846746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96846746 = 2 ⋅48423373.

It can be written as a sum of positive squares in 2 ways, for example, as 3330625 + 61434244 = 1825^2 + 7838^2 .

It is not a de Polignac number, because 64764869 - 2¹⁶ = 64699333 is a prime.

It is a super-2 number, since 2×64764869² = 8388976513174322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64764839) 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, 2490944 + ... + 2490969.

It is an arithmetic number, because the mean of its divisors is an integer number (17436699).

Almost surely, 2^64764869 is an apocalyptic number.

It is an amenable number.

64764869 is a deficient number, since it is larger than the sum of its proper divisors (4981927).

64764869 is a wasteful number, since it uses less digits than its factorization.

64764869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981926.

The product of its digits is 1741824, while the sum is 50.

The square root of 64764869 is about 8047.6623313854. The cubic root of 64764869 is about 401.5871709744.

The spelling of 64764869 in words is "sixty-four million, seven hundred sixty-four thousand, eight hundred sixty-nine".