64218949 has 4 divisors (see below), whose sum is σ = 66290560. Its totient is φ = 62147340.

The previous prime is 64218901. The next prime is 64218953. The reversal of 64218949 is 94981246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64218949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64218989) 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, 1035759 + ... + 1035820.

It is an arithmetic number, because the mean of its divisors is an integer number (16572640).

Almost surely, 2^64218949 is an apocalyptic number.

It is an amenable number.

64218949 is a deficient number, since it is larger than the sum of its proper divisors (2071611).

64218949 is a wasteful number, since it uses less digits than its factorization.

64218949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071610.

The product of its digits is 124416, while the sum is 43.

The square root of 64218949 is about 8013.6726287015. The cubic root of 64218949 is about 400.4556245686.

It can be divided in two parts, 642 and 18949, that added together give a palindrome (19591).

The spelling of 64218949 in words is "sixty-four million, two hundred eighteen thousand, nine hundred forty-nine".