77604761 has 4 divisors (see below), whose sum is σ = 83574372. Its totient is φ = 71635152.

The previous prime is 77604757. The next prime is 77604803. The reversal of 77604761 is 16740677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16740677 = 269 ⋅62233.

It can be written as a sum of positive squares in 2 ways, for example, as 24314761 + 53290000 = 4931^2 + 7300^2 .

It is a cyclic number.

It is not a de Polignac number, because 77604761 - 2² = 77604757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77604701) 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 3 ways as a sum of consecutive naturals, for example, 2984786 + ... + 2984811.

It is an arithmetic number, because the mean of its divisors is an integer number (20893593).

Almost surely, 2^77604761 is an apocalyptic number.

It is an amenable number.

77604761 is a deficient number, since it is larger than the sum of its proper divisors (5969611).

77604761 is a wasteful number, since it uses less digits than its factorization.

77604761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969610.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 77604761 is about 8809.3564464154. The cubic root of 77604761 is about 426.5429699879.

It can be divided in two parts, 7760 and 4761, that added together give a palindrome (12521).

The spelling of 77604761 in words is "seventy-seven million, six hundred four thousand, seven hundred sixty-one".