721869376 has 14 divisors (see below), whose sum is σ = 1432459670. Its totient is φ = 360934656.

The previous prime is 721869367. The next prime is 721869377. The reversal of 721869376 is 673968127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 548683776 + 173185600 = 23424^2 + 13160^2 .

It is not an unprimeable number, because it can be changed into a prime (721869377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5639541 + ... + 5639668.

Almost surely, 2^721869376 is an apocalyptic number.

It is an amenable number.

721869376 is a deficient number, since it is larger than the sum of its proper divisors (710590294).

721869376 is a wasteful number, since it uses less digits than its factorization.

721869376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11279221 (or 11279211 counting only the distinct ones).

The product of its digits is 762048, while the sum is 49.

The square root of 721869376 is about 26867.6269141880. The cubic root of 721869376 is about 897.0559669648.

The spelling of 721869376 in words is "seven hundred twenty-one million, eight hundred sixty-nine thousand, three hundred seventy-six".