721536552 has 192 divisors, whose sum is σ = 2320584000. Its totient is φ = 206997120.

The previous prime is 721536539. The next prime is 721536587. The reversal of 721536552 is 255635127.

721536552 is a `hidden beast` number, since 72 + 1 + 5 + 36 + 552 = 666.

It is a super-2 number, since 2×721536552² = 1041229991744097408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 495858 + ... + 497310.

It is an arithmetic number, because the mean of its divisors is an integer number (12086375).

Almost surely, 2^721536552 is an apocalyptic number.

721536552 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721536552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1160292000).

721536552 is an abundant number, since it is smaller than the sum of its proper divisors (1599047448).

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

721536552 is a wasteful number, since it uses less digits than its factorization.

721536552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1488 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 721536552 is about 26861.4324264362. The cubic root of 721536552 is about 896.9180806834.

The spelling of 721536552 in words is "seven hundred twenty-one million, five hundred thirty-six thousand, five hundred fifty-two".