61787273 has 4 divisors (see below), whose sum is σ = 62633748. Its totient is φ = 60940800.

The previous prime is 61787267. The next prime is 61787291. The reversal of 61787273 is 37278716.

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 54125449 + 7661824 = 7357^2 + 2768^2 .

It is a cyclic number.

It is not a de Polignac number, because 61787273 - 2⁸ = 61787017 is a prime.

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 61787273.

It is not an unprimeable number, because it can be changed into a prime (61787203) 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, 423128 + ... + 423273.

It is an arithmetic number, because the mean of its divisors is an integer number (15658437).

Almost surely, 2^61787273 is an apocalyptic number.

It is an amenable number.

61787273 is a deficient number, since it is larger than the sum of its proper divisors (846475).

61787273 is an equidigital number, since it uses as much as digits as its factorization.

61787273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846474.

The product of its digits is 98784, while the sum is 41.

The square root of 61787273 is about 7860.4880891711. The cubic root of 61787273 is about 395.3359807630.

It can be divided in two parts, 617872 and 73, that multiplied together give a square (45104656 = 6716²).

The spelling of 61787273 in words is "sixty-one million, seven hundred eighty-seven thousand, two hundred seventy-three".