75605997780 has 120 divisors (see below), whose sum is σ = 241654161672. Its totient is φ = 19781169408.

The previous prime is 75605997769. The next prime is 75605997781. The reversal of 75605997780 is 8779950657.

It can be written as a sum of positive squares in 4 ways, for example, as 38912296644 + 36693701136 = 197262^2 + 191556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75605997781) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 354427 + ... + 526146.

Almost surely, 2^75605997780 is an apocalyptic number.

It is an amenable number.

75605997780 is an abundant number, since it is smaller than the sum of its proper divisors (166048163892).

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

75605997780 is a wasteful number, since it uses less digits than its factorization.

75605997780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880647 (or 880636 counting only the distinct ones).

The product of its (nonzero) digits is 33339600, while the sum is 63.

The spelling of 75605997780 in words is "seventy-five billion, six hundred five million, nine hundred ninety-seven thousand, seven hundred eighty".