73121742 has 12 divisors (see below), whose sum is σ = 158430480. Its totient is φ = 24373908.

The previous prime is 73121683. The next prime is 73121749. The reversal of 73121742 is 24712137.

It is a happy number.

It is a super-2 number, since 2×73121742² = 10693578306229128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73121749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2031142 + ... + 2031177.

It is an arithmetic number, because the mean of its divisors is an integer number (13202540).

Almost surely, 2^73121742 is an apocalyptic number.

73121742 is an abundant number, since it is smaller than the sum of its proper divisors (85308738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73121742 is a wasteful number, since it uses less digits than its factorization.

73121742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062327 (or 4062324 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 73121742 is about 8551.1251891199. The cubic root of 73121742 is about 418.1661198810.

Adding to 73121742 its reverse (24712137), we get a palindrome (97833879).

The spelling of 73121742 in words is "seventy-three million, one hundred twenty-one thousand, seven hundred forty-two".