72180469 has 2 divisors, whose sum is σ = 72180470. Its totient is φ = 72180468.

The previous prime is 72180439. The next prime is 72180473. The reversal of 72180469 is 96408127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71740900 + 439569 = 8470^2 + 663^2 .

It is an emirp because it is prime and its reverse (96408127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72180469 - 2⁷ = 72180341 is a prime.

It is a super-2 number, since 2×72180469² = 10420040210119922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72180439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36090234 + 36090235.

It is an arithmetic number, because the mean of its divisors is an integer number (36090235).

Almost surely, 2^72180469 is an apocalyptic number.

It is an amenable number.

72180469 is a deficient number, since it is larger than the sum of its proper divisors (1).

72180469 is an equidigital number, since it uses as much as digits as its factorization.

72180469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 72180469 is about 8495.9089566685. The cubic root of 72180469 is about 416.3640585390.

The spelling of 72180469 in words is "seventy-two million, one hundred eighty thousand, four hundred sixty-nine".