127725978 has 24 divisors (see below), whose sum is σ = 261275328. Its totient is φ = 41607552.

The previous prime is 127725971. The next prime is 127725979. The reversal of 127725978 is 879527721.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (127725971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189450 + ... + 190122.

It is an arithmetic number, because the mean of its divisors is an integer number (10886472).

Almost surely, 2^127725978 is an apocalyptic number.

127725978 is an abundant number, since it is smaller than the sum of its proper divisors (133549350).

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

127725978 is an frugal number, since it uses more digits than its factorization.

127725978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 725 counting only the distinct ones).

The product of its digits is 493920, while the sum is 48.

The square root of 127725978 is about 11301.5918347815. The cubic root of 127725978 is about 503.6085316802.

The spelling of 127725978 in words is "one hundred twenty-seven million, seven hundred twenty-five thousand, nine hundred seventy-eight".