77445481 has 8 divisors (see below), whose sum is σ = 79234760. Its totient is φ = 75676032.

The previous prime is 77445469. The next prime is 77445491. The reversal of 77445481 is 18454477.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34987225 + 42458256 = 5915^2 + 6516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77445481 - 2¹⁹ = 76921193 is a prime.

It is a super-2 number, since 2×77445481² = 11995605054642722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77445491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3091 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (9904345).

Almost surely, 2^77445481 is an apocalyptic number.

It is an amenable number.

77445481 is a deficient number, since it is larger than the sum of its proper divisors (1789279).

77445481 is a wasteful number, since it uses less digits than its factorization.

77445481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9915.

The product of its digits is 125440, while the sum is 40.

The square root of 77445481 is about 8800.3114149444. The cubic root of 77445481 is about 426.2509505401.

It can be divided in two parts, 7744 and 5481, that added together give a square (13225 = 115²).

The spelling of 77445481 in words is "seventy-seven million, four hundred forty-five thousand, four hundred eighty-one".