42817664 has 16 divisors (see below), whose sum is σ = 85301070. Its totient is φ = 21408768.

The previous prime is 42817661. The next prime is 42817667. The reversal of 42817664 is 46671824.

It is an interprime number because it is at equal distance from previous prime (42817661) and next prime (42817667).

It can be written as a sum of positive squares in only one way, i.e., 40857664 + 1960000 = 6392^2 + 1400^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42817661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167129 + ... + 167384.

Almost surely, 2^42817664 is an apocalyptic number.

It is an amenable number.

42817664 is a deficient number, since it is larger than the sum of its proper divisors (42483406).

42817664 is an equidigital number, since it uses as much as digits as its factorization.

42817664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334527 (or 334515 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 42817664 is about 6543.5207648482. The cubic root of 42817664 is about 349.8439140758.

The spelling of 42817664 in words is "forty-two million, eight hundred seventeen thousand, six hundred sixty-four".