61782773 has 4 divisors (see below), whose sum is σ = 66535308. Its totient is φ = 57030240.

The previous prime is 61782767. The next prime is 61782779. The reversal of 61782773 is 37728716.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61782767) and next prime (61782779).

It can be written as a sum of positive squares in 2 ways, for example, as 42484324 + 19298449 = 6518^2 + 4393^2 .

It is a cyclic number.

It is not a de Polignac number, because 61782773 - 2¹⁶ = 61717237 is a prime.

It is a super-2 number, since 2×61782773² = 7634222079139058, 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 61782773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61782779) 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, 2376248 + ... + 2376273.

It is an arithmetic number, because the mean of its divisors is an integer number (16633827).

Almost surely, 2^61782773 is an apocalyptic number.

It is an amenable number.

61782773 is a deficient number, since it is larger than the sum of its proper divisors (4752535).

61782773 is a wasteful number, since it uses less digits than its factorization.

61782773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752534.

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

The square root of 61782773 is about 7860.2018421921. The cubic root of 61782773 is about 395.3263830200.

The spelling of 61782773 in words is "sixty-one million, seven hundred eighty-two thousand, seven hundred seventy-three".