77540484020 has 12 divisors (see below), whose sum is σ = 162835016484. Its totient is φ = 31016193600.

The previous prime is 77540483971. The next prime is 77540484061. The reversal of 77540484020 is 2048404577.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12197877136 + 65342606884 = 110444^2 + 255622^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 1938512081 + ... + 1938512120.

It is an arithmetic number, because the mean of its divisors is an integer number (13569584707).

Almost surely, 2^77540484020 is an apocalyptic number.

It is an amenable number.

77540484020 is an abundant number, since it is smaller than the sum of its proper divisors (85294532464).

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

77540484020 is a wasteful number, since it uses less digits than its factorization.

77540484020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877024210 (or 3877024208 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 41.

Adding to 77540484020 its reverse (2048404577), we get a palindrome (79588888597).

The spelling of 77540484020 in words is "seventy-seven billion, five hundred forty million, four hundred eighty-four thousand, twenty".