61744645 has 8 divisors (see below), whose sum is σ = 74167704. Its totient is φ = 49346304.

The previous prime is 61744643. The next prime is 61744649. The reversal of 61744645 is 54644716.

It can be written as a sum of positive squares in 4 ways, for example, as 9529569 + 52215076 = 3087^2 + 7226^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61744645 - 2¹ = 61744643 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 (61744643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144 + ... + 11113.

It is an arithmetic number, because the mean of its divisors is an integer number (9270963).

Almost surely, 2^61744645 is an apocalyptic number.

It is an amenable number.

61744645 is a deficient number, since it is larger than the sum of its proper divisors (12423059).

61744645 is a wasteful number, since it uses less digits than its factorization.

61744645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12359.

The product of its digits is 80640, while the sum is 37.

The square root of 61744645 is about 7857.7760848729. The cubic root of 61744645 is about 395.2450437009.

The spelling of 61744645 in words is "sixty-one million, seven hundred forty-four thousand, six hundred forty-five".