736621 has 4 divisors (see below), whose sum is σ = 768672. Its totient is φ = 704572.

The previous prime is 736607. The next prime is 736639. The reversal of 736621 is 126637.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-736621 is a prime.

It is a super-2 number, since 2×736621² = 1085220995282, which contains 22 as substring.

It is a Duffinian number.

736621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (736691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15991 + ... + 16036.

It is an arithmetic number, because the mean of its divisors is an integer number (192168).

2⁷³⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

736621 is a deficient number, since it is larger than the sum of its proper divisors (32051).

736621 is a wasteful number, since it uses less digits than its factorization.

736621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32050.

The product of its digits is 1512, while the sum is 25.

The square root of 736621 is about 858.2662756977. The cubic root of 736621 is about 90.3125348315.

The spelling of 736621 in words is "seven hundred thirty-six thousand, six hundred twenty-one".