77747481 has 24 divisors (see below), whose sum is σ = 128608064. Its totient is φ = 44336160.

The previous prime is 77747479. The next prime is 77747491. The reversal of 77747481 is 18474777.

It is a happy number.

It is not a de Polignac number, because 77747481 - 2¹ = 77747479 is a prime.

It is a super-2 number, since 2×77747481² = 12089341603690722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77747401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40710 + ... + 42576.

Almost surely, 2^77747481 is an apocalyptic number.

It is an amenable number.

77747481 is a deficient number, since it is larger than the sum of its proper divisors (50860583).

77747481 is a wasteful number, since it uses less digits than its factorization.

77747481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541 (or 2538 counting only the distinct ones).

The product of its digits is 307328, while the sum is 45.

The square root of 77747481 is about 8817.4532037318. The cubic root of 77747481 is about 426.8042895753.

The spelling of 77747481 in words is "seventy-seven million, seven hundred forty-seven thousand, four hundred eighty-one".