64187901 has 6 divisors (see below), whose sum is σ = 92715870. Its totient is φ = 42791928.

The previous prime is 64187899. The next prime is 64187927. The reversal of 64187901 is 10978146.

64187901 is a `hidden beast` number, since 641 + 8 + 7 + 9 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 2643876 = 7845^2 + 1626^2 .

It is not a de Polignac number, because 64187901 - 2¹ = 64187899 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64186901) 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 5 ways as a sum of consecutive naturals, for example, 3565986 + ... + 3566003.

It is an arithmetic number, because the mean of its divisors is an integer number (15452645).

Almost surely, 2^64187901 is an apocalyptic number.

It is an amenable number.

64187901 is a deficient number, since it is larger than the sum of its proper divisors (28527969).

64187901 is a wasteful number, since it uses less digits than its factorization.

64187901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7131995 (or 7131992 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 64187901 is about 8011.7352053098. The cubic root of 64187901 is about 400.3910779372.

The spelling of 64187901 in words is "sixty-four million, one hundred eighty-seven thousand, nine hundred one".