61457747 has 4 divisors (see below), whose sum is σ = 66185280. Its totient is φ = 56730216.

The previous prime is 61457743. The next prime is 61457749. The reversal of 61457747 is 74775416.

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

It is a cyclic number.

It is not a de Polignac number, because 61457747 - 2² = 61457743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61457743) 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, 2363747 + ... + 2363772.

It is an arithmetic number, because the mean of its divisors is an integer number (16546320).

Almost surely, 2^61457747 is an apocalyptic number.

61457747 is a deficient number, since it is larger than the sum of its proper divisors (4727533).

61457747 is a wasteful number, since it uses less digits than its factorization.

61457747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727532.

The product of its digits is 164640, while the sum is 41.

The square root of 61457747 is about 7839.4991549205. The cubic root of 61457747 is about 394.6319211743.

The spelling of 61457747 in words is "sixty-one million, four hundred fifty-seven thousand, seven hundred forty-seven".