7802672121 has 12 divisors (see below), whose sum is σ = 11933498772. Its totient is φ = 4895794176.

The previous prime is 7802672117. The next prime is 7802672149. The reversal of 7802672121 is 1212762087.

It can be written as a sum of positive squares in 2 ways, for example, as 5777672121 + 2025000000 = 76011^2 + 45000^2 .

It is not a de Polignac number, because 7802672121 - 2² = 7802672117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7802672621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25498776 + ... + 25499081.

It is an arithmetic number, because the mean of its divisors is an integer number (994458231).

Almost surely, 2^7802672121 is an apocalyptic number.

It is an amenable number.

7802672121 is a deficient number, since it is larger than the sum of its proper divisors (4130826651).

7802672121 is a wasteful number, since it uses less digits than its factorization.

7802672121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50997880 (or 50997877 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 7802672121 is about 88332.7352740761. The cubic root of 7802672121 is about 1983.4189239307.

The spelling of 7802672121 in words is "seven billion, eight hundred two million, six hundred seventy-two thousand, one hundred twenty-one".