64632191 has 24 divisors (see below), whose sum is σ = 73082880. Its totient is φ = 57092256.

The previous prime is 64632163. The next prime is 64632209. The reversal of 64632191 is 19123646.

It is not a de Polignac number, because 64632191 - 2¹⁰ = 64631167 is a prime.

It is a super-2 number, since 2×64632191² = 8354640226920962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64632101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 627446 + ... + 627548.

It is an arithmetic number, because the mean of its divisors is an integer number (3045120).

Almost surely, 2^64632191 is an apocalyptic number.

64632191 is a deficient number, since it is larger than the sum of its proper divisors (8450689).

64632191 is a wasteful number, since it uses less digits than its factorization.

64632191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 242 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 64632191 is about 8039.4148418899. The cubic root of 64632191 is about 401.3127515785.

The spelling of 64632191 in words is "sixty-four million, six hundred thirty-two thousand, one hundred ninety-one".