73721418 has 32 divisors (see below), whose sum is σ = 156816000. Its totient is φ = 23024640.

The previous prime is 73721411. The next prime is 73721419. The reversal of 73721418 is 81412737.

It is a happy number.

It is a super-3 number, since 3×73721418³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (73721411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23083 + ... + 26081.

It is an arithmetic number, because the mean of its divisors is an integer number (4900500).

Almost surely, 2^73721418 is an apocalyptic number.

73721418 is an abundant number, since it is smaller than the sum of its proper divisors (83094582).

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

73721418 is a wasteful number, since it uses less digits than its factorization.

73721418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262.

The product of its digits is 9408, while the sum is 33.

The square root of 73721418 is about 8586.1177490179. The cubic root of 73721418 is about 419.3061446061.

It can be divided in two parts, 737 and 21418, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 73721418 in words is "seventy-three million, seven hundred twenty-one thousand, four hundred eighteen".