2730749621 has 4 divisors (see below), whose sum is σ = 2730943200. Its totient is φ = 2730556044.

The previous prime is 2730749603. The next prime is 2730749639. The reversal of 2730749621 is 1269470372.

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 an interprime number because it is at equal distance from previous prime (2730749603) and next prime (2730749639).

It is a cyclic number.

It is not a de Polignac number, because 2730749621 - 2¹⁰ = 2730748597 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 (2730749821) 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, 73811 + ... + 104448.

It is an arithmetic number, because the mean of its divisors is an integer number (682735800).

Almost surely, 2^2730749621 is an apocalyptic number.

It is an amenable number.

2730749621 is a deficient number, since it is larger than the sum of its proper divisors (193579).

2730749621 is a wasteful number, since it uses less digits than its factorization.

2730749621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193578.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 2730749621 is about 52256.5749068957. The cubic root of 2730749621 is about 1397.7428972014.

The spelling of 2730749621 in words is "two billion, seven hundred thirty million, seven hundred forty-nine thousand, six hundred twenty-one".