73401681 has 4 divisors (see below), whose sum is σ = 97868912. Its totient is φ = 48934452.

The previous prime is 73401637. The next prime is 73401683. The reversal of 73401681 is 18610437.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18610437 = 3 ⋅6203479.

It is not a de Polignac number, because 73401681 - 2¹⁴ = 73385297 is a prime.

It is a super-2 number, since 2×73401681² = 10775613547251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73401683) 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, 12233611 + ... + 12233616.

It is an arithmetic number, because the mean of its divisors is an integer number (24467228).

Almost surely, 2^73401681 is an apocalyptic number.

It is an amenable number.

73401681 is a deficient number, since it is larger than the sum of its proper divisors (24467231).

73401681 is a wasteful number, since it uses less digits than its factorization.

73401681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24467230.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 73401681 is about 8567.4781003514. The cubic root of 73401681 is about 418.6990755330.

The spelling of 73401681 in words is "seventy-three million, four hundred one thousand, six hundred eighty-one".