77661436 has 12 divisors (see below), whose sum is σ = 143060680. Its totient is φ = 36786960.

The previous prime is 77661431. The next prime is 77661439. The reversal of 77661436 is 63416677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77661431) 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, 510855 + ... + 511006.

Almost surely, 2^77661436 is an apocalyptic number.

77661436 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

77661436 is a deficient number, since it is larger than the sum of its proper divisors (65399244).

77661436 is a wasteful number, since it uses less digits than its factorization.

77661436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021884 (or 1021882 counting only the distinct ones).

The product of its digits is 127008, while the sum is 40.

The square root of 77661436 is about 8812.5726096299. The cubic root of 77661436 is about 426.6467799433.

The spelling of 77661436 in words is "seventy-seven million, six hundred sixty-one thousand, four hundred thirty-six".