64420917 has 16 divisors (see below), whose sum is σ = 95473728. Its totient is φ = 38305280.

The previous prime is 64420913. The next prime is 64420921. The reversal of 64420917 is 71902446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64420913) and next prime (64420921).

It is a cyclic number.

It is not a de Polignac number, because 64420917 - 2² = 64420913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64420913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16668 + ... + 20165.

It is an arithmetic number, because the mean of its divisors is an integer number (5967108).

Almost surely, 2^64420917 is an apocalyptic number.

It is an amenable number.

64420917 is a deficient number, since it is larger than the sum of its proper divisors (31052811).

64420917 is a wasteful number, since it uses less digits than its factorization.

64420917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36900.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 64420917 is about 8026.2641994891. The cubic root of 64420917 is about 400.8749949805.

The spelling of 64420917 in words is "sixty-four million, four hundred twenty thousand, nine hundred seventeen".