7890142681 has 4 divisors (see below), whose sum is σ = 7966746112. Its totient is φ = 7813539252.

The previous prime is 7890142679. The next prime is 7890142693. The reversal of 7890142681 is 1862410987.

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: 1862410987 = 4027 ⋅462481.

It is a cyclic number.

It is not a de Polignac number, because 7890142681 - 2¹ = 7890142679 is a prime.

It is a super-2 number, since 2×7890142681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7890742681) 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, 38301561 + ... + 38301766.

It is an arithmetic number, because the mean of its divisors is an integer number (1991686528).

Almost surely, 2^7890142681 is an apocalyptic number.

It is an amenable number.

7890142681 is a deficient number, since it is larger than the sum of its proper divisors (76603431).

7890142681 is a wasteful number, since it uses less digits than its factorization.

7890142681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76603430.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 7890142681 is about 88826.4751129977. The cubic root of 7890142681 is about 1990.8029958008.

The spelling of 7890142681 in words is "seven billion, eight hundred ninety million, one hundred forty-two thousand, six hundred eighty-one".