721683051628 has 48 divisors (see below), whose sum is σ = 1574689132800. Its totient is φ = 281155942080.

The previous prime is 721683051613. The next prime is 721683051643. The reversal of 721683051628 is 826150386127.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (721683051613) and next prime (721683051643).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4926343 + ... + 5070721.

It is an arithmetic number, because the mean of its divisors is an integer number (32806023600).

Almost surely, 2^721683051628 is an apocalyptic number.

It is an amenable number.

721683051628 is an abundant number, since it is smaller than the sum of its proper divisors (853006081172).

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

721683051628 is a wasteful number, since it uses less digits than its factorization.

721683051628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160630 (or 160628 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 721683051628 in words is "seven hundred twenty-one billion, six hundred eighty-three million, fifty-one thousand, six hundred twenty-eight".