64420691 has 8 divisors (see below), whose sum is σ = 66299904. Its totient is φ = 62562760.

The previous prime is 64420679. The next prime is 64420703. The reversal of 64420691 is 19602446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64420679) and next prime (64420703).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64420691 - 2⁶ = 64420627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64420651) 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, 926 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (8287488).

Almost surely, 2^64420691 is an apocalyptic number.

64420691 is a deficient number, since it is larger than the sum of its proper divisors (1879213).

64420691 is a wasteful number, since it uses less digits than its factorization.

64420691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10641.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 64420691 is about 8026.2501206977. The cubic root of 64420691 is about 400.8745261997.

The spelling of 64420691 in words is "sixty-four million, four hundred twenty thousand, six hundred ninety-one".