61928779 has 4 divisors (see below), whose sum is σ = 67558680. Its totient is φ = 56298880.

The previous prime is 61928767. The next prime is 61928821. The reversal of 61928779 is 97782916.

It is a happy number.

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

It is not a de Polignac number, because 61928779 - 2⁷ = 61928651 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61928759) 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, 2814934 + ... + 2814955.

It is an arithmetic number, because the mean of its divisors is an integer number (16889670).

Almost surely, 2^61928779 is an apocalyptic number.

61928779 is a deficient number, since it is larger than the sum of its proper divisors (5629901).

61928779 is a wasteful number, since it uses less digits than its factorization.

61928779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629900.

The product of its digits is 381024, while the sum is 49.

The square root of 61928779 is about 7869.4840364537. The cubic root of 61928779 is about 395.6375518264.

The spelling of 61928779 in words is "sixty-one million, nine hundred twenty-eight thousand, seven hundred seventy-nine".