61643534 has 8 divisors (see below), whose sum is σ = 93283920. Its totient is φ = 30548896.

The previous prime is 61643507. The next prime is 61643539. The reversal of 61643534 is 43534616.

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

It is a self number, because there is not a number n which added to its sum of digits gives 61643534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61643539) 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, 136154 + ... + 136605.

It is an arithmetic number, because the mean of its divisors is an integer number (11660490).

Almost surely, 2^61643534 is an apocalyptic number.

61643534 is a deficient number, since it is larger than the sum of its proper divisors (31640386).

61643534 is a wasteful number, since it uses less digits than its factorization.

61643534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272874.

The product of its digits is 25920, while the sum is 32.

The square root of 61643534 is about 7851.3396309165. The cubic root of 61643534 is about 395.0291790654.

The spelling of 61643534 in words is "sixty-one million, six hundred forty-three thousand, five hundred thirty-four".