77554480 has 20 divisors (see below), whose sum is σ = 180314352. Its totient is φ = 31021760.

The previous prime is 77554471. The next prime is 77554483. The reversal of 77554480 is 8445577.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (77554483) 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 3 ways as a sum of consecutive naturals, for example, 484636 + ... + 484795.

Almost surely, 2^77554480 is an apocalyptic number.

It is an amenable number.

77554480 is an abundant number, since it is smaller than the sum of its proper divisors (102759872).

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

77554480 is a wasteful number, since it uses less digits than its factorization.

77554480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969444 (or 969438 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 77554480 is about 8806.5021433030. The cubic root of 77554480 is about 426.4508294182.

It can be divided in two parts, 775 and 54480, that added together give a palindrome (55255).

The spelling of 77554480 in words is "seventy-seven million, five hundred fifty-four thousand, four hundred eighty".