77555481 has 4 divisors (see below), whose sum is σ = 103407312. Its totient is φ = 51703652.

The previous prime is 77555447. The next prime is 77555507. The reversal of 77555481 is 18455577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77555481 - 2¹¹ = 77553433 is a prime.

It is a super-2 number, since 2×77555481² = 12029705266282722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77559481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12925911 + ... + 12925916.

It is an arithmetic number, because the mean of its divisors is an integer number (25851828).

Almost surely, 2^77555481 is an apocalyptic number.

It is an amenable number.

77555481 is a deficient number, since it is larger than the sum of its proper divisors (25851831).

77555481 is a wasteful number, since it uses less digits than its factorization.

77555481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25851830.

The product of its digits is 196000, while the sum is 42.

The square root of 77555481 is about 8806.5589761268. The cubic root of 77555481 is about 426.4526641519.

It can be divided in two parts, 775554 and 81, that added together give a triangular number (775635 = T₁₂₄₅).

The spelling of 77555481 in words is "seventy-seven million, five hundred fifty-five thousand, four hundred eighty-one".