64734819 has 4 divisors (see below), whose sum is σ = 86313096. Its totient is φ = 43156544.

The previous prime is 64734809. The next prime is 64734853. The reversal of 64734819 is 91843746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64734819 - 2⁸ = 64734563 is a prime.

It is a super-2 number, since 2×64734819² = 8381193581925522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64734809) 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, 10789134 + ... + 10789139.

It is an arithmetic number, because the mean of its divisors is an integer number (21578274).

Almost surely, 2^64734819 is an apocalyptic number.

64734819 is a deficient number, since it is larger than the sum of its proper divisors (21578277).

64734819 is a wasteful number, since it uses less digits than its factorization.

64734819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21578276.

The product of its digits is 145152, while the sum is 42.

The square root of 64734819 is about 8045.7951129767. The cubic root of 64734819 is about 401.5250510753.

The spelling of 64734819 in words is "sixty-four million, seven hundred thirty-four thousand, eight hundred nineteen".