721340554 has 8 divisors (see below), whose sum is σ = 1180375488. Its totient is φ = 327882060.

The previous prime is 721340551. The next prime is 721340591. The reversal of 721340554 is 455043127.

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

It is not an unprimeable number, because it can be changed into a prime (721340551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16394082 + ... + 16394125.

It is an arithmetic number, because the mean of its divisors is an integer number (147546936).

Almost surely, 2^721340554 is an apocalyptic number.

721340554 is a deficient number, since it is larger than the sum of its proper divisors (459034934).

721340554 is a wasteful number, since it uses less digits than its factorization.

721340554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32788220.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 721340554 is about 26857.7838624113. The cubic root of 721340554 is about 896.8368604646.

The spelling of 721340554 in words is "seven hundred twenty-one million, three hundred forty thousand, five hundred fifty-four".