61715643 has 32 divisors (see below), whose sum is σ = 92332032. Its totient is φ = 36352800.

The previous prime is 61715639. The next prime is 61715677. The reversal of 61715643 is 34651716.

It is not a de Polignac number, because 61715643 - 2² = 61715639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61715603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227598 + ... + 227868.

It is an arithmetic number, because the mean of its divisors is an integer number (2885376).

Almost surely, 2^61715643 is an apocalyptic number.

61715643 is a deficient number, since it is larger than the sum of its proper divisors (30616389).

61715643 is a wasteful number, since it uses less digits than its factorization.

61715643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its digits is 15120, while the sum is 33.

The square root of 61715643 is about 7855.9304350280. The cubic root of 61715643 is about 395.1831506575.

The spelling of 61715643 in words is "sixty-one million, seven hundred fifteen thousand, six hundred forty-three".