72801823 has 4 divisors (see below), whose sum is σ = 72844048. Its totient is φ = 72759600.

The previous prime is 72801793. The next prime is 72801887. The reversal of 72801823 is 32810827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72801823 - 2⁵ = 72801791 is a prime.

It is a super-3 number, since 3×72801823³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72801893) 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, 18411 + ... + 22012.

It is an arithmetic number, because the mean of its divisors is an integer number (18211012).

Almost surely, 2^72801823 is an apocalyptic number.

72801823 is a deficient number, since it is larger than the sum of its proper divisors (42225).

72801823 is a wasteful number, since it uses less digits than its factorization.

72801823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42224.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 72801823 is about 8532.3984318596. The cubic root of 72801823 is about 417.5553810383. Note that the first 3 decimals are identical.

The spelling of 72801823 in words is "seventy-two million, eight hundred one thousand, eight hundred twenty-three".