64735997 has 4 divisors (see below), whose sum is σ = 65555520. Its totient is φ = 63916476.

The previous prime is 64735901. The next prime is 64735999. The reversal of 64735997 is 79953746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64735997 - 2¹⁶ = 64670461 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 (64735999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409643 + ... + 409800.

It is an arithmetic number, because the mean of its divisors is an integer number (16388880).

Almost surely, 2^64735997 is an apocalyptic number.

It is an amenable number.

64735997 is a deficient number, since it is larger than the sum of its proper divisors (819523).

64735997 is an equidigital number, since it uses as much as digits as its factorization.

64735997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819522.

The product of its digits is 1428840, while the sum is 50.

The square root of 64735997 is about 8045.8683185844. The cubic root of 64735997 is about 401.5274866200.

The spelling of 64735997 in words is "sixty-four million, seven hundred thirty-five thousand, nine hundred ninety-seven".