77000720 has 20 divisors (see below), whose sum is σ = 179026860. Its totient is φ = 30800256.

The previous prime is 77000719. The next prime is 77000779. The reversal of 77000720 is 2700077.

It can be written as a sum of positive squares in 2 ways, for example, as 51437584 + 25563136 = 7172^2 + 5056^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×77000720² = 11858221761036800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481175 + ... + 481334.

It is an arithmetic number, because the mean of its divisors is an integer number (8951343).

Almost surely, 2^77000720 is an apocalyptic number.

It is an amenable number.

77000720 is an abundant number, since it is smaller than the sum of its proper divisors (102026140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77000720 is a wasteful number, since it uses less digits than its factorization.

77000720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962522 (or 962516 counting only the distinct ones).

The product of its (nonzero) digits is 686, while the sum is 23.

The square root of 77000720 is about 8775.0054131037. The cubic root of 77000720 is about 425.4334125295.

Adding to 77000720 its reverse (2700077), we get a palindrome (79700797).

The spelling of 77000720 in words is "seventy-seven million, seven hundred twenty", and thus it is an aban number.