77209193644 has 12 divisors (see below), whose sum is σ = 147399369768. Its totient is φ = 35095088000.

The previous prime is 77209193629. The next prime is 77209193653. The reversal of 77209193644 is 44639190277.

It is a super-2 number, since 2×77209193644² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77209193591 and 77209193600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877377157 + ... + 877377244.

It is an arithmetic number, because the mean of its divisors is an integer number (12283280814).

Almost surely, 2^77209193644 is an apocalyptic number.

It is an amenable number.

77209193644 is a deficient number, since it is larger than the sum of its proper divisors (70190176124).

77209193644 is a wasteful number, since it uses less digits than its factorization.

77209193644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754754416 (or 1754754414 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 77209193644 in words is "seventy-seven billion, two hundred nine million, one hundred ninety-three thousand, six hundred forty-four".