77445280090 has 12 divisors (see below), whose sum is σ = 139403088234. Its totient is φ = 30977760024.

The previous prime is 77445280063. The next prime is 77445280091. The reversal of 77445280090 is 9008254477.

It can be written as a sum of positive squares in only one way, i.e., 69700752081 + 7744528009 = 264009^2 + 88003^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77445280090.

It is not an unprimeable number, because it can be changed into a prime (77445280091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 836029 + ... + 924031.

Almost surely, 2^77445280090 is an apocalyptic number.

77445280090 is a deficient number, since it is larger than the sum of its proper divisors (61957808144).

77445280090 is an frugal number, since it uses more digits than its factorization.

77445280090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176013 (or 88010 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 77445280090 in words is "seventy-seven billion, four hundred forty-five million, two hundred eighty thousand, ninety".