7721045 has 4 divisors (see below), whose sum is σ = 9265260. Its totient is φ = 6176832.

The previous prime is 7721029. The next prime is 7721053. The reversal of 7721045 is 5401277.

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 872356 + 6848689 = 934^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 7721045 - 2⁴ = 7721029 is a prime.

It is a super-2 number, since 2×7721045² = 119229071784050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772100 + ... + 772109.

It is an arithmetic number, because the mean of its divisors is an integer number (2316315).

Almost surely, 2^7721045 is an apocalyptic number.

It is an amenable number.

7721045 is a deficient number, since it is larger than the sum of its proper divisors (1544215).

7721045 is a wasteful number, since it uses less digits than its factorization.

7721045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544214.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 7721045 is about 2778.6768433915. The cubic root of 7721045 is about 197.6478196892.

The spelling of 7721045 in words is "seven million, seven hundred twenty-one thousand, forty-five".