72403081 has 9 divisors (see below), whose sum is σ = 74083149. Its totient is φ = 70760844.

The previous prime is 72403061. The next prime is 72403087. The reversal of 72403081 is 18030427.

The square root of 72403081 is 8509.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 72403081 - 2²¹ = 70305929 is a prime.

It is a super-2 number, since 2×72403081² = 10484412276585122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72403087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 570040 + ... + 570166.

It is an arithmetic number, because the mean of its divisors is an integer number (8231461).

Almost surely, 2^72403081 is an apocalyptic number.

72403081 is the 8509-th square number.

72403081 is the 4255-th centered octagonal number.

It is an amenable number.

72403081 is a deficient number, since it is larger than the sum of its proper divisors (1680068).

72403081 is an frugal number, since it uses more digits than its factorization.

72403081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The cubic root of 72403081 is about 416.7916558005.

Multiplying 72403081 by its sum of digits (25), we get a square (1810077025 = 42545²).

The spelling of 72403081 in words is "seventy-two million, four hundred three thousand, eighty-one".