78198437 has 4 divisors (see below), whose sum is σ = 78348480. Its totient is φ = 78048396.

The previous prime is 78198431. The next prime is 78198451. The reversal of 78198437 is 73489187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78198437 - 2¹² = 78194341 is a prime.

It is a super-2 number, since 2×78198437² = 12229991098485938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78198391 and 78198400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78198431) 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, 74237 + ... + 75282.

It is an arithmetic number, because the mean of its divisors is an integer number (19587120).

Almost surely, 2^78198437 is an apocalyptic number.

It is an amenable number.

78198437 is a deficient number, since it is larger than the sum of its proper divisors (150043).

78198437 is a wasteful number, since it uses less digits than its factorization.

78198437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150042.

The product of its digits is 338688, while the sum is 47.

The square root of 78198437 is about 8842.9880131096. The cubic root of 78198437 is about 427.6278919251.

The spelling of 78198437 in words is "seventy-eight million, one hundred ninety-eight thousand, four hundred thirty-seven".