721512104 has 16 divisors (see below), whose sum is σ = 1396475520. Its totient is φ = 349118640.

The previous prime is 721512101. The next prime is 721512131. The reversal of 721512104 is 401215127.

It is a self number, because there is not a number n which added to its sum of digits gives 721512104.

It is not an unprimeable number, because it can be changed into a prime (721512101) 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, 1454414 + ... + 1454909.

It is an arithmetic number, because the mean of its divisors is an integer number (87279720).

Almost surely, 2^721512104 is an apocalyptic number.

It is an amenable number.

721512104 is a deficient number, since it is larger than the sum of its proper divisors (674963416).

721512104 is a wasteful number, since it uses less digits than its factorization.

721512104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909360 (or 2909356 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 721512104 is about 26860.9773463290. The cubic root of 721512104 is about 896.9079504039.

The spelling of 721512104 in words is "seven hundred twenty-one million, five hundred twelve thousand, one hundred four".