721472128678 has 8 divisors (see below), whose sum is σ = 1236809363472. Its totient is φ = 309202340856.

The previous prime is 721472128661. The next prime is 721472128693. The reversal of 721472128678 is 876821274127.

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

It is a congruent 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, 25766861725 + ... + 25766861752.

It is an arithmetic number, because the mean of its divisors is an integer number (154601170434).

Almost surely, 2^721472128678 is an apocalyptic number.

721472128678 is a deficient number, since it is larger than the sum of its proper divisors (515337234794).

721472128678 is a wasteful number, since it uses less digits than its factorization.

721472128678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51533723486.

The product of its digits is 4214784, while the sum is 55.

The spelling of 721472128678 in words is "seven hundred twenty-one billion, four hundred seventy-two million, one hundred twenty-eight thousand, six hundred seventy-eight".