726228990 has 80 divisors (see below), whose sum is σ = 1957063680. Its totient is φ = 193233600.

The previous prime is 726228977. The next prime is 726229003. The reversal of 726228990 is 99822627.

It is an interprime number because it is at equal distance from previous prime (726228977) and next prime (726229003).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 567171 + ... + 568449.

It is an arithmetic number, because the mean of its divisors is an integer number (24463296).

Almost surely, 2^726228990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 726228990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978531840).

726228990 is an abundant number, since it is smaller than the sum of its proper divisors (1230834690).

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

726228990 is a wasteful number, since it uses less digits than its factorization.

726228990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 726228990 is about 26948.6361435973. The cubic root of 726228990 is about 898.8582187632.

The spelling of 726228990 in words is "seven hundred twenty-six million, two hundred twenty-eight thousand, nine hundred ninety".