732740521 has 4 divisors (see below), whose sum is σ = 756377344. Its totient is φ = 709103700.

The previous prime is 732740513. The next prime is 732740543. The reversal of 732740521 is 125047237.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125047237 = 7 ⋅17863891.

It is a cyclic number.

It is not a de Polignac number, because 732740521 - 2³ = 732740513 is a prime.

It is a super-2 number, since 2×732740521² = 1073817342230702882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 23636791 = 732740521 / (7 + 3 + 2 + 7 + 4 + 0 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (732740551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11818365 + ... + 11818426.

It is an arithmetic number, because the mean of its divisors is an integer number (189094336).

Almost surely, 2^732740521 is an apocalyptic number.

It is an amenable number.

732740521 is a deficient number, since it is larger than the sum of its proper divisors (23636823).

732740521 is a wasteful number, since it uses less digits than its factorization.

732740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23636822.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 732740521 is about 27069.1802794248. The cubic root of 732740521 is about 901.5366837857.

Adding to 732740521 its reverse (125047237), we get a palindrome (857787758).

The spelling of 732740521 in words is "seven hundred thirty-two million, seven hundred forty thousand, five hundred twenty-one".