72174461 has 4 divisors (see below), whose sum is σ = 72985500. Its totient is φ = 71363424.

The previous prime is 72174451. The next prime is 72174463. The reversal of 72174461 is 16447127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16447127 = 2687 ⋅6121.

It can be written as a sum of positive squares in 2 ways, for example, as 4622500 + 67551961 = 2150^2 + 8219^2 .

It is a cyclic number.

It is not a de Polignac number, because 72174461 - 2¹⁴ = 72158077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72174463) 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, 405386 + ... + 405563.

It is an arithmetic number, because the mean of its divisors is an integer number (18246375).

Almost surely, 2^72174461 is an apocalyptic number.

It is an amenable number.

72174461 is a deficient number, since it is larger than the sum of its proper divisors (811039).

72174461 is an equidigital number, since it uses as much as digits as its factorization.

72174461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811038.

The product of its digits is 9408, while the sum is 32.

The square root of 72174461 is about 8495.5553673671. Note that the first 3 decimals coincide. The cubic root of 72174461 is about 416.3525060848.

The spelling of 72174461 in words is "seventy-two million, one hundred seventy-four thousand, four hundred sixty-one".