64736531 has 8 divisors (see below), whose sum is σ = 66287424. Its totient is φ = 63192960.

The previous prime is 64736519. The next prime is 64736549. The reversal of 64736531 is 13563746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64736531 - 2¹⁴ = 64720147 is a prime.

It is a super-2 number, since 2×64736531² = 8381636891827922, 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 = 64736491 and 64736500.

It is not an unprimeable number, because it can be changed into a prime (64736831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18761 + ... + 21941.

It is an arithmetic number, because the mean of its divisors is an integer number (8285928).

Almost surely, 2^64736531 is an apocalyptic number.

64736531 is a deficient number, since it is larger than the sum of its proper divisors (1550893).

64736531 is a wasteful number, since it uses less digits than its factorization.

64736531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661.

The product of its digits is 45360, while the sum is 35.

The square root of 64736531 is about 8045.9015032500. The cubic root of 64736531 is about 401.5285906687.

The spelling of 64736531 in words is "sixty-four million, seven hundred thirty-six thousand, five hundred thirty-one".