721128147 has 8 divisors (see below), whose sum is σ = 1012109760. Its totient is φ = 455449320.

The previous prime is 721128061. The next prime is 721128173. The reversal of 721128147 is 741821127.

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

It is not a de Polignac number, because 721128147 - 2¹² = 721124051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721128197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6325629 + ... + 6325742.

It is an arithmetic number, because the mean of its divisors is an integer number (126513720).

Almost surely, 2^721128147 is an apocalyptic number.

721128147 is a deficient number, since it is larger than the sum of its proper divisors (290981613).

721128147 is a wasteful number, since it uses less digits than its factorization.

721128147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12651393.

The product of its digits is 6272, while the sum is 33.

The square root of 721128147 is about 26853.8292800114. The cubic root of 721128147 is about 896.7488238561.

The spelling of 721128147 in words is "seven hundred twenty-one million, one hundred twenty-eight thousand, one hundred forty-seven".