78198653 has 8 divisors (see below), whose sum is σ = 84343896. Its totient is φ = 72072000.

The previous prime is 78198611. The next prime is 78198667. The reversal of 78198653 is 35689187.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17689 + 78180964 = 133^2 + 8842^2 .

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

It is not a de Polignac number, because 78198653 - 2¹⁰ = 78197629 is a prime.

It is a super-2 number, since 2×78198653² = 12230058662028818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78198598 and 78198607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78158653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4823 + ... + 13403.

It is an arithmetic number, because the mean of its divisors is an integer number (10542987).

Almost surely, 2^78198653 is an apocalyptic number.

It is an amenable number.

78198653 is a deficient number, since it is larger than the sum of its proper divisors (6145243).

78198653 is a wasteful number, since it uses less digits than its factorization.

78198653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9295.

The product of its digits is 362880, while the sum is 47.

The square root of 78198653 is about 8843.0002261676. Note that the first 3 decimals coincide. The cubic root of 78198653 is about 427.6282856565.

The spelling of 78198653 in words is "seventy-eight million, one hundred ninety-eight thousand, six hundred fifty-three".