7640881 has 4 divisors (see below), whose sum is σ = 7754992. Its totient is φ = 7526772.

The previous prime is 7640879. The next prime is 7640887. The reversal of 7640881 is 1880467.

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 not a de Polignac number, because 7640881 - 2¹ = 7640879 is a prime.

It is a super-2 number, since 2×7640881² = 116766124912322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7640887) 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, 56955 + ... + 57088.

It is an arithmetic number, because the mean of its divisors is an integer number (1938748).

Almost surely, 2^7640881 is an apocalyptic number.

It is an amenable number.

7640881 is a deficient number, since it is larger than the sum of its proper divisors (114111).

7640881 is a wasteful number, since it uses less digits than its factorization.

7640881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114110.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 7640881 is about 2764.2143549298. The cubic root of 7640881 is about 196.9614103255.

The spelling of 7640881 in words is "seven million, six hundred forty thousand, eight hundred eighty-one".