77700745 has 4 divisors (see below), whose sum is σ = 93240900. Its totient is φ = 62160592.

The previous prime is 77700743. The next prime is 77700757. The reversal of 77700745 is 54700777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54700777 = 5641 ⋅9697.

It can be written as a sum of positive squares in 2 ways, for example, as 24176889 + 53523856 = 4917^2 + 7316^2 .

It is a cyclic number.

It is not a de Polignac number, because 77700745 - 2¹ = 77700743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77700743) 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, 7770070 + ... + 7770079.

It is an arithmetic number, because the mean of its divisors is an integer number (23310225).

Almost surely, 2^77700745 is an apocalyptic number.

It is an amenable number.

77700745 is a deficient number, since it is larger than the sum of its proper divisors (15540155).

77700745 is a wasteful number, since it uses less digits than its factorization.

77700745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15540154.

The product of its (nonzero) digits is 48020, while the sum is 37.

The square root of 77700745 is about 8814.8026069788. The cubic root of 77700745 is about 426.7187514405.

The spelling of 77700745 in words is "seventy-seven million, seven hundred thousand, seven hundred forty-five".