77681652 has 24 divisors (see below), whose sum is σ = 190797600. Its totient is φ = 24530976.

The previous prime is 77681651. The next prime is 77681663. The reversal of 77681652 is 25618677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170127 + ... + 170582.

It is an arithmetic number, because the mean of its divisors is an integer number (7949900).

Almost surely, 2^77681652 is an apocalyptic number.

It is an amenable number.

77681652 is an abundant number, since it is smaller than the sum of its proper divisors (113115948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77681652 is a wasteful number, since it uses less digits than its factorization.

77681652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340735 (or 340733 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 77681652 is about 8813.7195326377. The cubic root of 77681652 is about 426.6837967840.

It can be divided in two parts, 776 and 81652, that added together give a palindrome (82428).

The spelling of 77681652 in words is "seventy-seven million, six hundred eighty-one thousand, six hundred fifty-two".