77620885 has 8 divisors (see below), whose sum is σ = 94902840. Its totient is φ = 60924864.

The previous prime is 77620877. The next prime is 77620889. The reversal of 77620885 is 58802677.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2815684 + 74805201 = 1678^2 + 8649^2 .

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 77620885 - 2³ = 77620877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77620889) 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 7 ways as a sum of consecutive naturals, for example, 146190 + ... + 146719.

It is an arithmetic number, because the mean of its divisors is an integer number (11862855).

Almost surely, 2^77620885 is an apocalyptic number.

It is an amenable number.

77620885 is a deficient number, since it is larger than the sum of its proper divisors (17281955).

77620885 is a wasteful number, since it uses less digits than its factorization.

77620885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292967.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 77620885 is about 8810.2715622165. The cubic root of 77620885 is about 426.5725089942.

The spelling of 77620885 in words is "seventy-seven million, six hundred twenty thousand, eight hundred eighty-five".