64867949 has 4 divisors (see below), whose sum is σ = 65931420. Its totient is φ = 63804480.

The previous prime is 64867931. The next prime is 64867967. The reversal of 64867949 is 94976846.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64867931) and next prime (64867967).

It can be written as a sum of positive squares in 2 ways, for example, as 1155625 + 63712324 = 1075^2 + 7982^2 .

It is a cyclic number.

It is not a de Polignac number, because 64867949 - 2²⁴ = 48090733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64867949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64867909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531644 + ... + 531765.

It is an arithmetic number, because the mean of its divisors is an integer number (16482855).

Almost surely, 2^64867949 is an apocalyptic number.

It is an amenable number.

64867949 is a deficient number, since it is larger than the sum of its proper divisors (1063471).

64867949 is a wasteful number, since it uses less digits than its factorization.

64867949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063470.

The product of its digits is 2612736, while the sum is 53.

The square root of 64867949 is about 8054.0641293697. The cubic root of 64867949 is about 401.8001139058.

The spelling of 64867949 in words is "sixty-four million, eight hundred sixty-seven thousand, nine hundred forty-nine".