77975423280 has 80 divisors (see below), whose sum is σ = 268582020960. Its totient is φ = 20793445632.

The previous prime is 77975423269. The next prime is 77975423287. The reversal of 77975423280 is 8232457977.

77975423280 is a `hidden beast` number, since 7 + 7 + 97 + 542 + 3 + 2 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (77975423287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18047707 + ... + 18052026.

It is an arithmetic number, because the mean of its divisors is an integer number (3357275262).

Almost surely, 2^77975423280 is an apocalyptic number.

It is an amenable number.

77975423280 is an abundant number, since it is smaller than the sum of its proper divisors (190606597680).

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

77975423280 is a wasteful number, since it uses less digits than its factorization.

77975423280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36099755 (or 36099743 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 77975423280 in words is "seventy-seven billion, nine hundred seventy-five million, four hundred twenty-three thousand, two hundred eighty".