127890991542 has 32 divisors (see below), whose sum is σ = 269330774400. Its totient is φ = 40373641728.

The previous prime is 127890991507. The next prime is 127890991661. The reversal of 127890991542 is 245199098721.

It is a super-2 number, since 2×127890991542² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178809 + ... + 536427.

It is an arithmetic number, because the mean of its divisors is an integer number (8416586700).

Almost surely, 2^127890991542 is an apocalyptic number.

It is a pronic number, being equal to 357618×357619.

127890991542 is an abundant number, since it is smaller than the sum of its proper divisors (141439782858).

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

127890991542 is a wasteful number, since it uses less digits than its factorization.

127890991542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360780.

The product of its (nonzero) digits is 3265920, while the sum is 57.

The spelling of 127890991542 in words is "one hundred twenty-seven billion, eight hundred ninety million, nine hundred ninety-one thousand, five hundred forty-two".