744130621 has 4 divisors (see below), whose sum is σ = 801371452. Its totient is φ = 686889792.

The previous prime is 744130559. The next prime is 744130627. The reversal of 744130621 is 126031447.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 223652025 + 520478596 = 14955^2 + 22814^2 .

It is a cyclic number.

It is not a de Polignac number, because 744130621 - 2⁷ = 744130493 is a prime.

It is a super-2 number, since 2×744130621² = 1107460762219691282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 744130621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744130627) 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, 28620396 + ... + 28620421.

It is an arithmetic number, because the mean of its divisors is an integer number (200342863).

Almost surely, 2^744130621 is an apocalyptic number.

It is an amenable number.

744130621 is a deficient number, since it is larger than the sum of its proper divisors (57240831).

744130621 is a wasteful number, since it uses less digits than its factorization.

744130621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57240830.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 744130621 is about 27278.7576879887. The cubic root of 744130621 is about 906.1840046686.

The spelling of 744130621 in words is "seven hundred forty-four million, one hundred thirty thousand, six hundred twenty-one".