61944779 has 4 divisors (see below), whose sum is σ = 66709776. Its totient is φ = 57179784.

The previous prime is 61944739. The next prime is 61944797. The reversal of 61944779 is 97744916.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61944779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61944709) 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, 2382479 + ... + 2382504.

It is an arithmetic number, because the mean of its divisors is an integer number (16677444).

Almost surely, 2^61944779 is an apocalyptic number.

61944779 is a deficient number, since it is larger than the sum of its proper divisors (4764997).

61944779 is a wasteful number, since it uses less digits than its factorization.

61944779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764996.

The product of its digits is 381024, while the sum is 47.

The square root of 61944779 is about 7870.5005558732. The cubic root of 61944779 is about 395.6716213702.

The spelling of 61944779 in words is "sixty-one million, nine hundred forty-four thousand, seven hundred seventy-nine".