61780961 has 8 divisors (see below), whose sum is σ = 67651200. Its totient is φ = 55953040.

The previous prime is 61780919. The next prime is 61780963. The reversal of 61780961 is 16908716.

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

It is not a de Polignac number, because 61780961 - 2¹⁰ = 61779937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61780963) 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, 7481 + ... + 13398.

It is an arithmetic number, because the mean of its divisors is an integer number (8456400).

Almost surely, 2^61780961 is an apocalyptic number.

It is an amenable number.

61780961 is a deficient number, since it is larger than the sum of its proper divisors (5870239).

61780961 is a wasteful number, since it uses less digits than its factorization.

61780961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21159.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61780961 is about 7860.0865771313. The cubic root of 61780961 is about 395.3225181972.

The spelling of 61780961 in words is "sixty-one million, seven hundred eighty thousand, nine hundred sixty-one".