7740028121 has 4 divisors (see below), whose sum is σ = 8845746432. Its totient is φ = 6634309812.

The previous prime is 7740028091. The next prime is 7740028123. The reversal of 7740028121 is 1218200477.

It is a happy number.

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-7740028121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7740028123) 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, 552859145 + ... + 552859158.

It is an arithmetic number, because the mean of its divisors is an integer number (2211436608).

Almost surely, 2^7740028121 is an apocalyptic number.

It is an amenable number.

7740028121 is a deficient number, since it is larger than the sum of its proper divisors (1105718311).

7740028121 is a wasteful number, since it uses less digits than its factorization.

7740028121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105718310.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 7740028121 is about 87977.4296112361. The cubic root of 7740028121 is about 1978.0966746054.

Adding to 7740028121 its reverse (1218200477), we get a palindrome (8958228598).

The spelling of 7740028121 in words is "seven billion, seven hundred forty million, twenty-eight thousand, one hundred twenty-one".