77454981 has 16 divisors (see below), whose sum is σ = 115888320. Its totient is φ = 51123600.

The previous prime is 77454977. The next prime is 77454989. The reversal of 77454981 is 18945477.

It is a happy number.

It is not a de Polignac number, because 77454981 - 2² = 77454977 is a prime.

It is a super-2 number, since 2×77454981² = 11998548163420722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77454989) 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, 11475 + ... + 16928.

It is an arithmetic number, because the mean of its divisors is an integer number (7243020).

Almost surely, 2^77454981 is an apocalyptic number.

It is an amenable number.

77454981 is a deficient number, since it is larger than the sum of its proper divisors (38433339).

77454981 is a wasteful number, since it uses less digits than its factorization.

77454981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28513 (or 28507 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 77454981 is about 8800.8511520193. The cubic root of 77454981 is about 426.2683787938.

It can be divided in two parts, 774 and 54981, that added together give a palindrome (55755).

The spelling of 77454981 in words is "seventy-seven million, four hundred fifty-four thousand, nine hundred eighty-one".