77243950644 has 72 divisors (see below), whose sum is σ = 210716049600. Its totient is φ = 21958763904.

The previous prime is 77243950627. The next prime is 77243950649. The reversal of 77243950644 is 44605934277.

It is a happy number.

It is a super-2 number, since 2×77243950644² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77243950649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213057 + ... + 447080.

It is an arithmetic number, because the mean of its divisors is an integer number (2926611800).

Almost surely, 2^77243950644 is an apocalyptic number.

It is an amenable number.

77243950644 is an abundant number, since it is smaller than the sum of its proper divisors (133472098956).

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

77243950644 is a wasteful number, since it uses less digits than its factorization.

77243950644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660357 (or 660348 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 51.

The spelling of 77243950644 in words is "seventy-seven billion, two hundred forty-three million, nine hundred fifty thousand, six hundred forty-four".