127650721 has 16 divisors (see below), whose sum is σ = 151646400. Its totient is φ = 106142400.

The previous prime is 127650701. The next prime is 127650737. The reversal of 127650721 is 127056721.

It is a cyclic number.

It is not a de Polignac number, because 127650721 - 2²¹ = 125553569 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127650701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4470 + ... + 16591.

It is an arithmetic number, because the mean of its divisors is an integer number (9477900).

Almost surely, 2^127650721 is an apocalyptic number.

127650721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127650721 is a deficient number, since it is larger than the sum of its proper divisors (23995679).

127650721 is a wasteful number, since it uses less digits than its factorization.

127650721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21120.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 127650721 is about 11298.2618574717. The cubic root of 127650721 is about 503.5096024100.

The spelling of 127650721 in words is "one hundred twenty-seven million, six hundred fifty thousand, seven hundred twenty-one".