126720978 has 8 divisors (see below), whose sum is σ = 253441968. Its totient is φ = 42240324.

The previous prime is 126720953. The next prime is 126720991. The reversal of 126720978 is 879027621.

It is a sphenic number, since it is the product of 3 distinct primes.

126720978 is an admirable number.

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, 10560076 + ... + 10560087.

It is an arithmetic number, because the mean of its divisors is an integer number (31680246).

Almost surely, 2^126720978 is an apocalyptic number.

126720978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

126720978 is a wasteful number, since it uses less digits than its factorization.

126720978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21120168.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 126720978 is about 11257.0412631384. The cubic root of 126720978 is about 502.2841864277.

The spelling of 126720978 in words is "one hundred twenty-six million, seven hundred twenty thousand, nine hundred seventy-eight".