721342670 has 16 divisors (see below), whose sum is σ = 1299025728. Its totient is φ = 288401760.

The previous prime is 721342637. The next prime is 721342709. The reversal of 721342670 is 76243127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7100 + ... + 38640.

It is an arithmetic number, because the mean of its divisors is an integer number (81189108).

Almost surely, 2^721342670 is an apocalyptic number.

721342670 is a deficient number, since it is larger than the sum of its proper divisors (577683058).

721342670 is a wasteful number, since it uses less digits than its factorization.

721342670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33835.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 721342670 is about 26857.8232550592. The cubic root of 721342670 is about 896.8377373990.

Adding to 721342670 its reverse (76243127), we get a palindrome (797585797).

The spelling of 721342670 in words is "seven hundred twenty-one million, three hundred forty-two thousand, six hundred seventy".