72505401 has 4 divisors (see below), whose sum is σ = 96673872. Its totient is φ = 48336932.

The previous prime is 72505399. The next prime is 72505403. The reversal of 72505401 is 10450527.

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 an interprime number because it is at equal distance from previous prime (72505399) and next prime (72505403).

It is a cyclic number.

It is not a de Polignac number, because 72505401 - 2¹ = 72505399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72505403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12084231 + ... + 12084236.

It is an arithmetic number, because the mean of its divisors is an integer number (24168468).

Almost surely, 2^72505401 is an apocalyptic number.

It is an amenable number.

72505401 is a deficient number, since it is larger than the sum of its proper divisors (24168471).

72505401 is a wasteful number, since it uses less digits than its factorization.

72505401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24168470.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 72505401 is about 8515.0103346972. The cubic root of 72505401 is about 416.9878999761.

Adding to 72505401 its reverse (10450527), we get a palindrome (82955928).

The spelling of 72505401 in words is "seventy-two million, five hundred five thousand, four hundred one".