77694989 has 4 divisors (see below), whose sum is σ = 81073056. Its totient is φ = 74316924.

The previous prime is 77694983. The next prime is 77695019. The reversal of 77694989 is 98949677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98949677 = 2113 ⋅46829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77694989 is a prime.

It is a super-2 number, since 2×77694989² = 12073022631420242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77694983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688999 + ... + 1689044.

It is an arithmetic number, because the mean of its divisors is an integer number (20268264).

Almost surely, 2^77694989 is an apocalyptic number.

It is an amenable number.

77694989 is a deficient number, since it is larger than the sum of its proper divisors (3378067).

77694989 is a wasteful number, since it uses less digits than its factorization.

77694989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378066.

The product of its digits is 6858432, while the sum is 59.

The square root of 77694989 is about 8814.4761046814. The cubic root of 77694989 is about 426.7082142022.

The spelling of 77694989 in words is "seventy-seven million, six hundred ninety-four thousand, nine hundred eighty-nine".