73721849540 has 24 divisors (see below), whose sum is σ = 159000098712. Its totient is φ = 28691746560.

The previous prime is 73721849527. The next prime is 73721849581. The reversal of 73721849540 is 4594812737.

It can be written as a sum of positive squares in 4 ways, for example, as 37097841664 + 36624007876 = 192608^2 + 191374^2 .

It is a super-2 number, since 2×73721849540² (a number of 23 digits) contains 22 as substring.

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, 49811321 + ... + 49812800.

It is an arithmetic number, because the mean of its divisors is an integer number (6625004113).

Almost surely, 2^73721849540 is an apocalyptic number.

It is an amenable number.

73721849540 is an abundant number, since it is smaller than the sum of its proper divisors (85278249172).

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

73721849540 is a wasteful number, since it uses less digits than its factorization.

73721849540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99624167 (or 99624165 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 73721849540 in words is "seventy-three billion, seven hundred twenty-one million, eight hundred forty-nine thousand, five hundred forty".