721428610 has 32 divisors (see below), whose sum is σ = 1486524672. Its totient is φ = 246939840.

The previous prime is 721428607. The next prime is 721428629. The reversal of 721428610 is 16824127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36004 + ... + 52336.

It is an arithmetic number, because the mean of its divisors is an integer number (46453896).

Almost surely, 2^721428610 is an apocalyptic number.

721428610 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

721428610 is an abundant number, since it is smaller than the sum of its proper divisors (765096062).

721428610 is a wasteful number, since it uses less digits than its factorization.

721428610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 721428610 is about 26859.4231136858. The cubic root of 721428610 is about 896.8733520833.

The spelling of 721428610 in words is "seven hundred twenty-one million, four hundred twenty-eight thousand, six hundred ten".