72040661 has 8 divisors (see below), whose sum is σ = 89817024. Its totient is φ = 56135520.

The previous prime is 72040637. The next prime is 72040663. The reversal of 72040661 is 16604027.

72040661 = T₂₀₇₃ + T₂₀₇₄ + ... + T₂₁₀₅.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72040661 - 2¹⁰ = 72039637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72040661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72040663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467720 + ... + 467873.

It is an arithmetic number, because the mean of its divisors is an integer number (11227128).

Almost surely, 2^72040661 is an apocalyptic number.

It is an amenable number.

72040661 is a deficient number, since it is larger than the sum of its proper divisors (17776363).

72040661 is a wasteful number, since it uses less digits than its factorization.

72040661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935611.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 72040661 is about 8487.6770084635. The cubic root of 72040661 is about 416.0950631028.

Adding to 72040661 its reverse (16604027), we get a palindrome (88644688).

The spelling of 72040661 in words is "seventy-two million, forty thousand, six hundred sixty-one".