72545401 has 4 divisors (see below), whose sum is σ = 76363600. Its totient is φ = 68727204.

The previous prime is 72545399. The next prime is 72545449. The reversal of 72545401 is 10454527.

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 72545401 - 2¹ = 72545399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72545401.

It is not an unprimeable number, because it can be changed into a prime (72545471) 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, 1909071 + ... + 1909108.

It is an arithmetic number, because the mean of its divisors is an integer number (19090900).

Almost surely, 2^72545401 is an apocalyptic number.

It is an amenable number.

72545401 is a deficient number, since it is larger than the sum of its proper divisors (3818199).

72545401 is a wasteful number, since it uses less digits than its factorization.

72545401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818198.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 72545401 is about 8517.3588042303. The cubic root of 72545401 is about 417.0645675965.

Adding to 72545401 its reverse (10454527), we get a palindrome (82999928).

The spelling of 72545401 in words is "seventy-two million, five hundred forty-five thousand, four hundred one".