64305531 has 12 divisors (see below), whose sum is σ = 93739360. Its totient is φ = 42476400.

The previous prime is 64305523. The next prime is 64305547. The reversal of 64305531 is 13550346.

It is not a de Polignac number, because 64305531 - 2³ = 64305523 is a prime.

It is a super-2 number, since 2×64305531² = 8270402634383922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64305495 and 64305504.

It is not an unprimeable number, because it can be changed into a prime (64305551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31795 + ... + 33756.

Almost surely, 2^64305531 is an apocalyptic number.

64305531 is a deficient number, since it is larger than the sum of its proper divisors (29433829).

64305531 is a wasteful number, since it uses less digits than its factorization.

64305531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65666 (or 65663 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 64305531 is about 8019.0729514078. The cubic root of 64305531 is about 400.6355126910.

Adding to 64305531 its reverse (13550346), we get a palindrome (77855877).

The spelling of 64305531 in words is "sixty-four million, three hundred five thousand, five hundred thirty-one".