721421480 has 32 divisors (see below), whose sum is σ = 1748061000. Its totient is φ = 266370816.

The previous prime is 721421461. The next prime is 721421521. The reversal of 721421480 is 84124127.

It can be written as a sum of positive squares in 4 ways, for example, as 643028164 + 78393316 = 25358^2 + 8854^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693155 + ... + 694194.

Almost surely, 2^721421480 is an apocalyptic number.

It is an amenable number.

721421480 is an abundant number, since it is smaller than the sum of its proper divisors (1026639520).

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

721421480 is a wasteful number, since it uses less digits than its factorization.

721421480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387373 (or 1387369 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 721421480 is about 26859.2903852652. The cubic root of 721421480 is about 896.8703974236.

The spelling of 721421480 in words is "seven hundred twenty-one million, four hundred twenty-one thousand, four hundred eighty".