721434675 has 96 divisors (see below), whose sum is σ = 1367912448. Its totient is φ = 332766720.

The previous prime is 721434673. The next prime is 721434743. The reversal of 721434675 is 576434127.

It is not a de Polignac number, because 721434675 - 2¹ = 721434673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (721434671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1188222 + ... + 1188828.

It is an arithmetic number, because the mean of its divisors is an integer number (14249088).

Almost surely, 2^721434675 is an apocalyptic number.

721434675 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721434675 is a deficient number, since it is larger than the sum of its proper divisors (646477773).

721434675 is a wasteful number, since it uses less digits than its factorization.

721434675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 704 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 721434675 is about 26859.5360160968. The cubic root of 721434675 is about 896.8758653935.

The spelling of 721434675 in words is "seven hundred twenty-one million, four hundred thirty-four thousand, six hundred seventy-five".