64531906 has 16 divisors (see below), whose sum is σ = 99335808. Its totient is φ = 31424400.

The previous prime is 64531903. The next prime is 64531933. The reversal of 64531906 is 60913546.

It is not an unprimeable number, because it can be changed into a prime (64531903) 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, 36196 + ... + 37936.

It is an arithmetic number, because the mean of its divisors is an integer number (6208488).

Almost surely, 2^64531906 is an apocalyptic number.

64531906 is a deficient number, since it is larger than the sum of its proper divisors (34803902).

64531906 is a wasteful number, since it uses less digits than its factorization.

64531906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 64531906 is about 8033.1753373121. The cubic root of 64531906 is about 401.1050816747.

The spelling of 64531906 in words is "sixty-four million, five hundred thirty-one thousand, nine hundred six".