64691532 has 18 divisors (see below), whose sum is σ = 163525908. Its totient is φ = 21563832.

The previous prime is 64691527. The next prime is 64691551. The reversal of 64691532 is 23519646.

It is a happy number.

64691532 is a `hidden beast` number, since 64 + 69 + 1 + 532 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1796987 = 64691532 / (6 + 4 + 6 + 9 + 1 + 5 + 3 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 898458 + ... + 898529.

Almost surely, 2^64691532 is an apocalyptic number.

It is an amenable number.

64691532 is an abundant number, since it is smaller than the sum of its proper divisors (98834376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64691532 is a wasteful number, since it uses less digits than its factorization.

64691532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796997 (or 1796992 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 64691532 is about 8043.1046244594. The cubic root of 64691532 is about 401.4355336117.

It can be divided in two parts, 6469 and 1532, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 64691532 in words is "sixty-four million, six hundred ninety-one thousand, five hundred thirty-two".