721874780 has 96 divisors (see below), whose sum is σ = 1737469440. Its totient is φ = 249370880.

The previous prime is 721874767. The next prime is 721874819. The reversal of 721874780 is 87478127.

It is a super-2 number, since 2×721874780² = 1042206396000096800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 905342 + ... + 906138.

It is an arithmetic number, because the mean of its divisors is an integer number (18098640).

Almost surely, 2^721874780 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 721874780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868734720).

721874780 is an abundant number, since it is smaller than the sum of its proper divisors (1015594660).

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

721874780 is a wasteful number, since it uses less digits than its factorization.

721874780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 44.

The square root of 721874780 is about 26867.7274811250. The cubic root of 721874780 is about 897.0582054485.

It can be divided in two parts, 72187 and 4780, that added together give a palindrome (76967).

The spelling of 721874780 in words is "seven hundred twenty-one million, eight hundred seventy-four thousand, seven hundred eighty".