61440779 has 4 divisors (see below), whose sum is σ = 61466184. Its totient is φ = 61415376.

The previous prime is 61440767. The next prime is 61440787. The reversal of 61440779 is 97704416.

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

It is a cyclic number.

It is not a de Polignac number, because 61440779 - 2¹⁶ = 61375243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61440719) 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, 8642 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (15366546).

Almost surely, 2^61440779 is an apocalyptic number.

61440779 is a deficient number, since it is larger than the sum of its proper divisors (25405).

61440779 is a wasteful number, since it uses less digits than its factorization.

61440779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25404.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 61440779 is about 7838.4168682203. The cubic root of 61440779 is about 394.5955995761.

The spelling of 61440779 in words is "sixty-one million, four hundred forty thousand, seven hundred seventy-nine".