72042281 has 12 divisors (see below), whose sum is σ = 77173200. Its totient is φ = 67065840.

The previous prime is 72042263. The next prime is 72042283. The reversal of 72042281 is 18224027.

It is not a de Polignac number, because 72042281 - 2¹⁴ = 72025897 is a prime.

It is a super-2 number, since 2×72042281² = 10380180503365922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72042281.

It is not an unprimeable number, because it can be changed into a prime (72042283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70190 + ... + 71208.

It is an arithmetic number, because the mean of its divisors is an integer number (6431100).

Almost surely, 2^72042281 is an apocalyptic number.

It is an amenable number.

72042281 is a deficient number, since it is larger than the sum of its proper divisors (5130919).

72042281 is a wasteful number, since it uses less digits than its factorization.

72042281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72042281 is about 8487.7724403992. The cubic root of 72042281 is about 416.0981820310.

The spelling of 72042281 in words is "seventy-two million, forty-two thousand, two hundred eighty-one".