664071442 has 16 divisors (see below), whose sum is σ = 1058088312. Its totient is φ = 311500800.

The previous prime is 664071389. The next prime is 664071461. The reversal of 664071442 is 244170466.

664071442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 611523441 + 52548001 = 24729^2 + 7249^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 664071398 and 664071407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20559 + ... + 41842.

Almost surely, 2^664071442 is an apocalyptic number.

664071442 is a deficient number, since it is larger than the sum of its proper divisors (394016870).

664071442 is a wasteful number, since it uses less digits than its factorization.

664071442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62733.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 664071442 is about 25769.5836598110. The cubic root of 664071442 is about 872.4454218288.

The spelling of 664071442 in words is "six hundred sixty-four million, seventy-one thousand, four hundred forty-two".