7940640898 has 8 divisors (see below), whose sum is σ = 11911345740. Its totient is φ = 3970192320.

The previous prime is 7940640893. The next prime is 7940640899. The reversal of 7940640898 is 8980460497.

It can be written as a sum of positive squares in 2 ways, for example, as 7646278249 + 294362649 = 87443^2 + 17157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7940640893) 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, 67158 + ... + 142798.

Almost surely, 2^7940640898 is an apocalyptic number.

7940640898 is a deficient number, since it is larger than the sum of its proper divisors (3970704842).

7940640898 is a wasteful number, since it uses less digits than its factorization.

7940640898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128132.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 7940640898 is about 89110.2738072328. The cubic root of 7940640898 is about 1995.0411230984.

The spelling of 7940640898 in words is "seven billion, nine hundred forty million, six hundred forty thousand, eight hundred ninety-eight".