77641745 has 8 divisors (see below), whose sum is σ = 93311784. Its totient is φ = 62018944.

The previous prime is 77641723. The next prime is 77641747. The reversal of 77641745 is 54714677.

It can be written as a sum of positive squares in 4 ways, for example, as 20729809 + 56911936 = 4553^2 + 7544^2 .

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 77641745 - 2¹² = 77637649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77641747) 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, 8084 + ... + 14853.

It is an arithmetic number, because the mean of its divisors is an integer number (11663973).

Almost surely, 2^77641745 is an apocalyptic number.

It is an amenable number.

77641745 is a deficient number, since it is larger than the sum of its proper divisors (15670039).

77641745 is a wasteful number, since it uses less digits than its factorization.

77641745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23619.

The product of its digits is 164640, while the sum is 41.

The square root of 77641745 is about 8811.4553281510. The cubic root of 77641745 is about 426.6107182362.

The spelling of 77641745 in words is "seventy-seven million, six hundred forty-one thousand, seven hundred forty-five".