61440777 has 12 divisors (see below), whose sum is σ = 89263044. Its totient is φ = 40722720.

The previous prime is 61440767. The next prime is 61440787. The reversal of 61440777 is 77704416.

It is an interprime number because it is at equal distance from previous prime (61440767) and next prime (61440787).

It can be written as a sum of positive squares in 2 ways, for example, as 39200121 + 22240656 = 6261^2 + 4716^2 .

It is not a de Polignac number, because 61440777 - 2⁴ = 61440761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61440767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18174 + ... + 21287.

It is an arithmetic number, because the mean of its divisors is an integer number (7438587).

Almost surely, 2^61440777 is an apocalyptic number.

It is an amenable number.

61440777 is a deficient number, since it is larger than the sum of its proper divisors (27822267).

61440777 is a wasteful number, since it uses less digits than its factorization.

61440777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39640 (or 39637 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 61440777 is about 7838.4167406435. The cubic root of 61440777 is about 394.5955952945.

The spelling of 61440777 in words is "sixty-one million, four hundred forty thousand, seven hundred seventy-seven".