77297481 has 12 divisors (see below), whose sum is σ = 112221252. Its totient is φ = 51268896.

The previous prime is 77297449. The next prime is 77297489. The reversal of 77297481 is 18479277.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36542025 + 40755456 = 6045^2 + 6384^2 .

It is not a de Polignac number, because 77297481 - 2⁵ = 77297449 is a prime.

It is a super-2 number, since 2×77297481² = 11949801137890722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77297489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20026 + ... + 23571.

It is an arithmetic number, because the mean of its divisors is an integer number (9351771).

Almost surely, 2^77297481 is an apocalyptic number.

It is an amenable number.

77297481 is a deficient number, since it is larger than the sum of its proper divisors (34923771).

77297481 is a wasteful number, since it uses less digits than its factorization.

77297481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43800 (or 43797 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 77297481 is about 8791.8986004162. The cubic root of 77297481 is about 425.9792524445.

The spelling of 77297481 in words is "seventy-seven million, two hundred ninety-seven thousand, four hundred eighty-one".