64436385 has 32 divisors (see below), whose sum is σ = 111420288. Its totient is φ = 31610880.

The previous prime is 64436377. The next prime is 64436413. The reversal of 64436385 is 58363446.

It is not a de Polignac number, because 64436385 - 2³ = 64436377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95409 + ... + 96081.

It is an arithmetic number, because the mean of its divisors is an integer number (3481884).

Almost surely, 2^64436385 is an apocalyptic number.

64436385 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64436385 is a deficient number, since it is larger than the sum of its proper divisors (46983903).

64436385 is a wasteful number, since it uses less digits than its factorization.

64436385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185.

The product of its digits is 207360, while the sum is 39.

The square root of 64436385 is about 8027.2277281761. The cubic root of 64436385 is about 400.9070768906.

The spelling of 64436385 in words is "sixty-four million, four hundred thirty-six thousand, three hundred eighty-five".