64623547 has 2 divisors, whose sum is σ = 64623548. Its totient is φ = 64623546.

The previous prime is 64623529. The next prime is 64623553. The reversal of 64623547 is 74532646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64623547 is a prime.

It is a super-2 number, since 2×64623547² = 8352405653722418, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64623347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32311773 + 32311774.

It is an arithmetic number, because the mean of its divisors is an integer number (32311774).

Almost surely, 2^64623547 is an apocalyptic number.

64623547 is a deficient number, since it is larger than the sum of its proper divisors (1).

64623547 is an equidigital number, since it uses as much as digits as its factorization.

64623547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 37.

The square root of 64623547 is about 8038.8772225977. The cubic root of 64623547 is about 401.2948600705.

Subtracting 64623547 from its reverse (74532646), we obtain a palindrome (9909099).

The spelling of 64623547 in words is "sixty-four million, six hundred twenty-three thousand, five hundred forty-seven".