72563897 has 4 divisors (see below), whose sum is σ = 82930176. Its totient is φ = 62197620.

The previous prime is 72563893. The next prime is 72563903. The reversal of 72563897 is 79836527.

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: 79836527 = 5669 ⋅14083.

It is a cyclic number.

It is not a de Polignac number, because 72563897 - 2² = 72563893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72563893) 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, 5183129 + ... + 5183142.

It is an arithmetic number, because the mean of its divisors is an integer number (20732544).

Almost surely, 2^72563897 is an apocalyptic number.

It is an amenable number.

72563897 is a deficient number, since it is larger than the sum of its proper divisors (10366279).

72563897 is a wasteful number, since it uses less digits than its factorization.

72563897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10366278.

The product of its digits is 635040, while the sum is 47.

The square root of 72563897 is about 8518.4445176335. Note that the first 3 decimals coincide. The cubic root of 72563897 is about 417.1000091758.

The spelling of 72563897 in words is "seventy-two million, five hundred sixty-three thousand, eight hundred ninety-seven".