77039681 has 8 divisors (see below), whose sum is σ = 79849728. Its totient is φ = 74250000.

The previous prime is 77039657. The next prime is 77039701. The reversal of 77039681 is 18693077.

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 77039681 - 2¹⁰ = 77038657 is a prime.

It is a super-4 number, since 4×77039681⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77039881) 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, 2831 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (9981216).

Almost surely, 2^77039681 is an apocalyptic number.

It is an amenable number.

77039681 is a deficient number, since it is larger than the sum of its proper divisors (2810047).

77039681 is a wasteful number, since it uses less digits than its factorization.

77039681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 77039681 is about 8777.2251309853. The cubic root of 77039681 is about 425.5051543537.

The spelling of 77039681 in words is "seventy-seven million, thirty-nine thousand, six hundred eighty-one".