721828612 has 6 divisors (see below), whose sum is σ = 1263200078. Its totient is φ = 360914304.

The previous prime is 721828607. The next prime is 721828631. The reversal of 721828612 is 216828127.

It can be written as a sum of positive squares in only one way, i.e., 721781956 + 46656 = 26866^2 + 216^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90228573 + ... + 90228580.

Almost surely, 2^721828612 is an apocalyptic number.

It is an amenable number.

721828612 is a deficient number, since it is larger than the sum of its proper divisors (541371466).

721828612 is a wasteful number, since it uses less digits than its factorization.

721828612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180457157 (or 180457155 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 721828612 is about 26866.8682953559. The cubic root of 721828612 is about 897.0390810484.

The spelling of 721828612 in words is "seven hundred twenty-one million, eight hundred twenty-eight thousand, six hundred twelve".