61785397 has 4 divisors (see below), whose sum is σ = 65037280. Its totient is φ = 58533516.

The previous prime is 61785391. The next prime is 61785403. The reversal of 61785397 is 79358716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (61785391) and next prime (61785403).

It is a cyclic number.

It is not a de Polignac number, because 61785397 - 2³ = 61785389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61785391) 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, 1625913 + ... + 1625950.

It is an arithmetic number, because the mean of its divisors is an integer number (16259320).

Almost surely, 2^61785397 is an apocalyptic number.

It is an amenable number.

61785397 is a deficient number, since it is larger than the sum of its proper divisors (3251883).

61785397 is a wasteful number, since it uses less digits than its factorization.

61785397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251882.

The product of its digits is 317520, while the sum is 46.

The square root of 61785397 is about 7860.3687572531. The cubic root of 61785397 is about 395.3319796272.

The spelling of 61785397 in words is "sixty-one million, seven hundred eighty-five thousand, three hundred ninety-seven".