721775652 has 48 divisors (see below), whose sum is σ = 1820212800. Its totient is φ = 221286528.

The previous prime is 721775651. The next prime is 721775653. The reversal of 721775652 is 256577127.

It is an interprime number because it is at equal distance from previous prime (721775651) and next prime (721775653).

It is not an unprimeable number, because it can be changed into a prime (721775651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35974 + ... + 52322.

It is an arithmetic number, because the mean of its divisors is an integer number (37921100).

Almost surely, 2^721775652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721775652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910106400).

721775652 is an abundant number, since it is smaller than the sum of its proper divisors (1098437148).

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

721775652 is a wasteful number, since it uses less digits than its factorization.

721775652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16652 (or 16650 counting only the distinct ones).

The product of its digits is 205800, while the sum is 42.

The square root of 721775652 is about 26865.8826767333. The cubic root of 721775652 is about 897.0171421602.

The spelling of 721775652 in words is "seven hundred twenty-one million, seven hundred seventy-five thousand, six hundred fifty-two".