127944777720 has 32 divisors (see below), whose sum is σ = 383834333520. Its totient is φ = 34118607360.

The previous prime is 127944777713. The next prime is 127944777739. The reversal of 127944777720 is 27777449721.

It is a happy number.

It is a super-2 number, since 2×127944777720² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533103121 + ... + 533103360.

Almost surely, 2^127944777720 is an apocalyptic number.

127944777720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

127944777720 is an abundant number, since it is smaller than the sum of its proper divisors (255889555800).

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

127944777720 is a wasteful number, since it uses less digits than its factorization.

127944777720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066206495 (or 1066206491 counting only the distinct ones).

The product of its (nonzero) digits is 9680832, while the sum is 57.

The spelling of 127944777720 in words is "one hundred twenty-seven billion, nine hundred forty-four million, seven hundred seventy-seven thousand, seven hundred twenty".