72810061 has 4 divisors (see below), whose sum is σ = 72859392. Its totient is φ = 72760732.

The previous prime is 72810047. The next prime is 72810077. The reversal of 72810061 is 16001827.

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 72810061 - 2⁵ = 72810029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72810091) 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, 22381 + ... + 25426.

It is an arithmetic number, because the mean of its divisors is an integer number (18214848).

Almost surely, 2^72810061 is an apocalyptic number.

It is an amenable number.

72810061 is a deficient number, since it is larger than the sum of its proper divisors (49331).

72810061 is a wasteful number, since it uses less digits than its factorization.

72810061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49330.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 72810061 is about 8532.8811664056. The cubic root of 72810061 is about 417.5711301471.

Adding to 72810061 its reverse (16001827), we get a palindrome (88811888).

The spelling of 72810061 in words is "seventy-two million, eight hundred ten thousand, sixty-one".