730487021 has 16 divisors (see below), whose sum is σ = 807031680. Its totient is φ = 655672320.

The previous prime is 730486993. The next prime is 730487033. The reversal of 730487021 is 120784037.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 730487021 - 2¹⁰ = 730485997 is a prime.

It is a super-2 number, since 2×730487021² = 1067222575698908882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730487071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489845 + ... + 491333.

It is an arithmetic number, because the mean of its divisors is an integer number (50439480).

Almost surely, 2^730487021 is an apocalyptic number.

It is an amenable number.

730487021 is a deficient number, since it is larger than the sum of its proper divisors (76544659).

730487021 is a wasteful number, since it uses less digits than its factorization.

730487021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 730487021 is about 27027.5233974554. The cubic root of 730487021 is about 900.6115271870.

The spelling of 730487021 in words is "seven hundred thirty million, four hundred eighty-seven thousand, twenty-one".