61820779 has 8 divisors (see below), whose sum is σ = 64293120. Its totient is φ = 59371200.

The previous prime is 61820777. The next prime is 61820797. The reversal of 61820779 is 97702816.

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

It is a cyclic number.

It is not a de Polignac number, because 61820779 - 2¹ = 61820777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61820771) 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, 42 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (8036640).

Almost surely, 2^61820779 is an apocalyptic number.

61820779 is a deficient number, since it is larger than the sum of its proper divisors (2472341).

61820779 is a wasteful number, since it uses less digits than its factorization.

61820779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11381.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 61820779 is about 7862.6190928977. The cubic root of 61820779 is about 395.4074287764.

The spelling of 61820779 in words is "sixty-one million, eight hundred twenty thousand, seven hundred seventy-nine".