78898630321 has 9 divisors (see below), whose sum is σ = 91782326649. Its totient is φ = 67625712084.

The previous prime is 78898630303. The next prime is 78898630357. The reversal of 78898630321 is 12303689887.

The square root of 78898630321 is 280889.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 78898630321 - 2⁹ = 78898629809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78898630021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1946160 + ... + 1986286.

Almost surely, 2^78898630321 is an apocalyptic number.

78898630321 is the 280889-th square number.

78898630321 is the 140445-th centered octagonal number.

It is an amenable number.

78898630321 is a deficient number, since it is larger than the sum of its proper divisors (12883696328).

78898630321 is an frugal number, since it uses more digits than its factorization.

78898630321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80268 (or 40134 counting only the distinct ones).

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

The spelling of 78898630321 in words is "seventy-eight billion, eight hundred ninety-eight million, six hundred thirty thousand, three hundred twenty-one".