61817649 has 8 divisors (see below), whose sum is σ = 82471200. Its totient is φ = 41187936.

The previous prime is 61817611. The next prime is 61817669. The reversal of 61817649 is 94671816.

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

It is not a de Polignac number, because 61817649 - 2⁷ = 61817521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61817649.

It is not an unprimeable number, because it can be changed into a prime (61817669) 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, 1389 + ... + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (10308900).

Almost surely, 2^61817649 is an apocalyptic number.

It is an amenable number.

61817649 is a deficient number, since it is larger than the sum of its proper divisors (20653551).

61817649 is a wasteful number, since it uses less digits than its factorization.

61817649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919.

The product of its digits is 72576, while the sum is 42.

The square root of 61817649 is about 7862.4200472882. The cubic root of 61817649 is about 395.4007554746.

The spelling of 61817649 in words is "sixty-one million, eight hundred seventeen thousand, six hundred forty-nine".