77814681 has 32 divisors (see below), whose sum is σ = 127746048. Its totient is φ = 41152320.

The previous prime is 77814677. The next prime is 77814683. The reversal of 77814681 is 18641877.

It is a happy number.

It is not a de Polignac number, because 77814681 - 2² = 77814677 is a prime.

It is a super-2 number, since 2×77814681² = 12110249158263522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77814683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12375 + ... + 17571.

It is an arithmetic number, because the mean of its divisors is an integer number (3992064).

Almost surely, 2^77814681 is an apocalyptic number.

It is an amenable number.

77814681 is a deficient number, since it is larger than the sum of its proper divisors (49931367).

77814681 is a wasteful number, since it uses less digits than its factorization.

77814681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261.

The product of its digits is 75264, while the sum is 42.

The square root of 77814681 is about 8821.2630048083. The cubic root of 77814681 is about 426.9272216988.

The spelling of 77814681 in words is "seventy-seven million, eight hundred fourteen thousand, six hundred eighty-one".