7698021638 has 8 divisors (see below), whose sum is σ = 11945206080. Its totient is φ = 3716286280.

The previous prime is 7698021631. The next prime is 7698021641. The reversal of 7698021638 is 8361208967.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7698021631) 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, 66362198 + ... + 66362313.

It is an arithmetic number, because the mean of its divisors is an integer number (1493150760).

Almost surely, 2^7698021638 is an apocalyptic number.

7698021638 is a deficient number, since it is larger than the sum of its proper divisors (4247184442).

7698021638 is a wasteful number, since it uses less digits than its factorization.

7698021638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132724542.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 7698021638 is about 87738.3703860517. The cubic root of 7698021638 is about 1974.5116893931.

The spelling of 7698021638 in words is "seven billion, six hundred ninety-eight million, twenty-one thousand, six hundred thirty-eight".