64405497 has 32 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 35906112.

The previous prime is 64405489. The next prime is 64405513. The reversal of 64405497 is 79450446.

It is a happy number.

It is not a de Polignac number, because 64405497 - 2³ = 64405489 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (64405417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15154 + ... + 18932.

It is an arithmetic number, because the mean of its divisors is an integer number (3175200).

Almost surely, 2^64405497 is an apocalyptic number.

It is an amenable number.

64405497 is a deficient number, since it is larger than the sum of its proper divisors (37200903).

64405497 is a wasteful number, since it uses less digits than its factorization.

64405497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 64405497 is about 8025.3035456611. The cubic root of 64405497 is about 400.8430075144.

The spelling of 64405497 in words is "sixty-four million, four hundred five thousand, four hundred ninety-seven".