73402721 has 16 divisors (see below), whose sum is σ = 86776704. Its totient is φ = 60787584.

The previous prime is 73402717. The next prime is 73402733. The reversal of 73402721 is 12720437.

It is a cyclic number.

It is not a de Polignac number, because 73402721 - 2² = 73402717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73422721) 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, 23381 + ... + 26333.

It is an arithmetic number, because the mean of its divisors is an integer number (5423544).

Almost surely, 2^73402721 is an apocalyptic number.

It is an amenable number.

73402721 is a deficient number, since it is larger than the sum of its proper divisors (13373983).

73402721 is a wasteful number, since it uses less digits than its factorization.

73402721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 73402721 is about 8567.5387947765. The cubic root of 73402721 is about 418.7010529854.

The spelling of 73402721 in words is "seventy-three million, four hundred two thousand, seven hundred twenty-one".