721349436 has 24 divisors (see below), whose sum is σ = 1692452944. Its totient is φ = 239120640.

The previous prime is 721349413. The next prime is 721349507. The reversal of 721349436 is 634943127.

It is a junction number, because it is equal to n+sod(n) for n = 721349394 and 721349403.

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, 163885 + ... + 168228.

Almost surely, 2^721349436 is an apocalyptic number.

It is an amenable number.

721349436 is an abundant number, since it is smaller than the sum of its proper divisors (971103508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721349436 is a wasteful number, since it uses less digits than its factorization.

721349436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332301 (or 332299 counting only the distinct ones).

The product of its digits is 108864, while the sum is 39.

The square root of 721349436 is about 26857.9492143388. The cubic root of 721349436 is about 896.8405414224.

The spelling of 721349436 in words is "seven hundred twenty-one million, three hundred forty-nine thousand, four hundred thirty-six".