72461281 has 4 divisors (see below), whose sum is σ = 74419732. Its totient is φ = 70502832.

The previous prime is 72461243. The next prime is 72461297. The reversal of 72461281 is 18216427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 11621281 = 7800^2 + 3409^2 .

It is a cyclic number.

It is not a de Polignac number, because 72461281 - 2⁷ = 72461153 is a prime.

It is a super-2 number, since 2×72461281² = 10501274488321922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72461681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979170 + ... + 979243.

It is an arithmetic number, because the mean of its divisors is an integer number (18604933).

Almost surely, 2^72461281 is an apocalyptic number.

It is an amenable number.

72461281 is a deficient number, since it is larger than the sum of its proper divisors (1958451).

72461281 is a wasteful number, since it uses less digits than its factorization.

72461281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958450.

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

The square root of 72461281 is about 8512.4192213495. The cubic root of 72461281 is about 416.9033028803.

The spelling of 72461281 in words is "seventy-two million, four hundred sixty-one thousand, two hundred eighty-one".