721342116 has 36 divisors (see below), whose sum is σ = 1989156624. Its totient is φ = 218588400.

The previous prime is 721342091. The next prime is 721342117. The reversal of 721342116 is 611243127.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 721342116.

It is not an unprimeable number, because it can be changed into a prime (721342117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 910390 + ... + 911181.

Almost surely, 2^721342116 is an apocalyptic number.

It is an amenable number.

721342116 is an abundant number, since it is smaller than the sum of its proper divisors (1267814508).

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

721342116 is a wasteful number, since it uses less digits than its factorization.

721342116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821592 (or 1821587 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 721342116 is about 26857.8129414887. The cubic root of 721342116 is about 896.8375078048.

The spelling of 721342116 in words is "seven hundred twenty-one million, three hundred forty-two thousand, one hundred sixteen".