721120875 has 32 divisors (see below), whose sum is σ = 1270541376. Its totient is φ = 361971200.

The previous prime is 721120871. The next prime is 721120919. The reversal of 721120875 is 578021127.

It is not a de Polignac number, because 721120875 - 2² = 721120871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721120871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50184 + ... + 62933.

It is an arithmetic number, because the mean of its divisors is an integer number (39704418).

Almost surely, 2^721120875 is an apocalyptic number.

721120875 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721120875 is a deficient number, since it is larger than the sum of its proper divisors (549420501).

721120875 is a wasteful number, since it uses less digits than its factorization.

721120875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113152 (or 113142 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 721120875 is about 26853.6938799860. The cubic root of 721120875 is about 896.7458095147.

The spelling of 721120875 in words is "seven hundred twenty-one million, one hundred twenty thousand, eight hundred seventy-five".