75721042 has 16 divisors (see below), whose sum is σ = 122106240. Its totient is φ = 35103888.

The previous prime is 75721031. The next prime is 75721049. The reversal of 75721042 is 24012757.

It is a self number, because there is not a number n which added to its sum of digits gives 75721042.

It is not an unprimeable number, because it can be changed into a prime (75721049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19413 + ... + 22984.

It is an arithmetic number, because the mean of its divisors is an integer number (7631640).

Almost surely, 2^75721042 is an apocalyptic number.

75721042 is a deficient number, since it is larger than the sum of its proper divisors (46385198).

75721042 is a wasteful number, since it uses less digits than its factorization.

75721042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42465.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 75721042 is about 8701.7838401100. The cubic root of 75721042 is about 423.0634700312.

Adding to 75721042 its reverse (24012757), we get a palindrome (99733799).

The spelling of 75721042 in words is "seventy-five million, seven hundred twenty-one thousand, forty-two".