73720081 has 4 divisors (see below), whose sum is σ = 74758464. Its totient is φ = 72681700.

The previous prime is 73720067. The next prime is 73720099. The reversal of 73720081 is 18002737.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73720081 - 2²⁵ = 40165649 is a prime.

It is a super-2 number, since 2×73720081² = 10869300685293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73720051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519085 + ... + 519226.

It is an arithmetic number, because the mean of its divisors is an integer number (18689616).

Almost surely, 2^73720081 is an apocalyptic number.

73720081 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

73720081 is a deficient number, since it is larger than the sum of its proper divisors (1038383).

73720081 is a wasteful number, since it uses less digits than its factorization.

73720081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038382.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 73720081 is about 8586.0398904268. The cubic root of 73720081 is about 419.3036097674.

The spelling of 73720081 in words is "seventy-three million, seven hundred twenty thousand, eighty-one".