64631534 has 16 divisors (see below), whose sum is σ = 105885360. Its totient is φ = 29343360.

The previous prime is 64631527. The next prime is 64631543. The reversal of 64631534 is 43513646.

It is a self number, because there is not a number n which added to its sum of digits gives 64631534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31772 + ... + 33744.

It is an arithmetic number, because the mean of its divisors is an integer number (6617835).

Almost surely, 2^64631534 is an apocalyptic number.

64631534 is a deficient number, since it is larger than the sum of its proper divisors (41253826).

64631534 is a wasteful number, since it uses less digits than its factorization.

64631534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475.

The product of its digits is 25920, while the sum is 32.

The square root of 64631534 is about 8039.3739806032. The cubic root of 64631534 is about 401.3113917640.

It can be divided in two parts, 6463 and 1534, that added together give a palindrome (7997).

The spelling of 64631534 in words is "sixty-four million, six hundred thirty-one thousand, five hundred thirty-four".