642243693 has 64 divisors (see below), whose sum is σ = 1081794560. Its totient is φ = 329951232.

The previous prime is 642243691. The next prime is 642243703. The reversal of 642243693 is 396342246.

It is not a de Polignac number, because 642243693 - 2¹ = 642243691 is a prime.

It is a super-2 number, since 2×642243693² = 824953922396556498, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642243691) 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 63 ways as a sum of consecutive naturals, for example, 2091846 + ... + 2092152.

It is an arithmetic number, because the mean of its divisors is an integer number (16903040).

Almost surely, 2^642243693 is an apocalyptic number.

It is an amenable number.

642243693 is a deficient number, since it is larger than the sum of its proper divisors (439550867).

642243693 is a wasteful number, since it uses less digits than its factorization.

642243693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its digits is 186624, while the sum is 39.

The square root of 642243693 is about 25342.5273601510. The cubic root of 642243693 is about 862.7797618822.

The spelling of 642243693 in words is "six hundred forty-two million, two hundred forty-three thousand, six hundred ninety-three".