78198929 has 8 divisors (see below), whose sum is σ = 84561408. Its totient is φ = 72032320.

The previous prime is 78198863. The next prime is 78198937. The reversal of 78198929 is 92989187.

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

It is a cyclic number.

It is not a de Polignac number, because 78198929 - 2²⁴ = 61421713 is a prime.

It is a super-2 number, since 2×78198929² = 12230144993494082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78198949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48137 + ... + 49734.

It is an arithmetic number, because the mean of its divisors is an integer number (10570176).

Almost surely, 2^78198929 is an apocalyptic number.

It is an amenable number.

78198929 is a deficient number, since it is larger than the sum of its proper divisors (6362479).

78198929 is a wasteful number, since it uses less digits than its factorization.

78198929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97935.

The product of its digits is 653184, while the sum is 53.

The square root of 78198929 is about 8843.0158317171. The cubic root of 78198929 is about 427.6287887566.

The spelling of 78198929 in words is "seventy-eight million, one hundred ninety-eight thousand, nine hundred twenty-nine".