64807491 has 16 divisors (see below), whose sum is σ = 103048704. Its totient is φ = 35422464.

The previous prime is 64807481. The next prime is 64807517. The reversal of 64807491 is 19470846.

It is a happy number.

It is not a de Polignac number, because 64807491 - 2⁶ = 64807427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64807441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66606 + ... + 67571.

It is an arithmetic number, because the mean of its divisors is an integer number (6440544).

Almost surely, 2^64807491 is an apocalyptic number.

64807491 is a deficient number, since it is larger than the sum of its proper divisors (38241213).

64807491 is a wasteful number, since it uses less digits than its factorization.

64807491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134210.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 64807491 is about 8050.3099940313. The cubic root of 64807491 is about 401.6752469907.

The spelling of 64807491 in words is "sixty-four million, eight hundred seven thousand, four hundred ninety-one".