721347804 has 144 divisors (see below), whose sum is σ = 1987614720. Its totient is φ = 219922560.

The previous prime is 721347799. The next prime is 721347853. The reversal of 721347804 is 408743127.

721347804 = T₂₇₄₉ + T₂₇₅₀ + ... + T₂₉₂₇.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4029787 + ... + 4029965.

It is an arithmetic number, because the mean of its divisors is an integer number (13802880).

Almost surely, 2^721347804 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 721347804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993807360).

721347804 is an abundant number, since it is smaller than the sum of its proper divisors (1266266916).

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

721347804 is a wasteful number, since it uses less digits than its factorization.

721347804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 721347804 is about 26857.9188322550. The cubic root of 721347804 is about 896.8398650766.

The spelling of 721347804 in words is "seven hundred twenty-one million, three hundred forty-seven thousand, eight hundred four".