7621881 has 4 divisors (see below), whose sum is σ = 10162512. Its totient is φ = 5081252.

The previous prime is 7621843. The next prime is 7621883. The reversal of 7621881 is 1881267.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1881267 = 3 ⋅627089.

It is a cyclic number.

It is not a de Polignac number, because 7621881 - 2¹⁴ = 7605497 is a prime.

It is a super-2 number, since 2×7621881² = 116186139956322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7621883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270311 + ... + 1270316.

It is an arithmetic number, because the mean of its divisors is an integer number (2540628).

Almost surely, 2^7621881 is an apocalyptic number.

It is an amenable number.

7621881 is a deficient number, since it is larger than the sum of its proper divisors (2540631).

7621881 is a wasteful number, since it uses less digits than its factorization.

7621881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540630.

The product of its digits is 5376, while the sum is 33.

The square root of 7621881 is about 2760.7754345473. The cubic root of 7621881 is about 196.7980184793.

The spelling of 7621881 in words is "seven million, six hundred twenty-one thousand, eight hundred eighty-one".