73736721 has 6 divisors (see below), whose sum is σ = 106508610. Its totient is φ = 49157808.

The previous prime is 73736717. The next prime is 73736743. The reversal of 73736721 is 12763737.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 1299600 = 8511^2 + 1140^2 .

It is not a de Polignac number, because 73736721 - 2² = 73736717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73736771) 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, 4096476 + ... + 4096493.

It is an arithmetic number, because the mean of its divisors is an integer number (17751435).

Almost surely, 2^73736721 is an apocalyptic number.

It is an amenable number.

73736721 is a deficient number, since it is larger than the sum of its proper divisors (32771889).

73736721 is a wasteful number, since it uses less digits than its factorization.

73736721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8192975 (or 8192972 counting only the distinct ones).

The product of its digits is 37044, while the sum is 36.

The square root of 73736721 is about 8587.0088505835. The cubic root of 73736721 is about 419.3351556144.

The spelling of 73736721 in words is "seventy-three million, seven hundred thirty-six thousand, seven hundred twenty-one".