730657421 has 8 divisors (see below), whose sum is σ = 789348504. Its totient is φ = 672321600.

The previous prime is 730657387. The next prime is 730657423. The reversal of 730657421 is 124756037.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 707028100 = 4861^2 + 26590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 730657421 - 2¹⁸ = 730395277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730657423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84530 + ... + 92771.

It is an arithmetic number, because the mean of its divisors is an integer number (98668563).

Almost surely, 2^730657421 is an apocalyptic number.

It is an amenable number.

730657421 is a deficient number, since it is larger than the sum of its proper divisors (58691083).

730657421 is a wasteful number, since it uses less digits than its factorization.

730657421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177631.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 730657421 is about 27030.6755557459. The cubic root of 730657421 is about 900.6815500022.

The spelling of 730657421 in words is "seven hundred thirty million, six hundred fifty-seven thousand, four hundred twenty-one".