78252197 has 4 divisors (see below), whose sum is σ = 78352416. Its totient is φ = 78151980.

The previous prime is 78252157. The next prime is 78252199. The reversal of 78252197 is 79125287.

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 78252197 - 2⁸ = 78251941 is a prime.

It is a super-2 number, since 2×78252197² = 12246812670653618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78252199) 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, 48929 + ... + 50502.

It is an arithmetic number, because the mean of its divisors is an integer number (19588104).

Almost surely, 2^78252197 is an apocalyptic number.

It is an amenable number.

78252197 is a deficient number, since it is larger than the sum of its proper divisors (100219).

78252197 is an equidigital number, since it uses as much as digits as its factorization.

78252197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100218.

The product of its digits is 70560, while the sum is 41.

The square root of 78252197 is about 8846.0271873876. The cubic root of 78252197 is about 427.7258649372.

The spelling of 78252197 in words is "seventy-eight million, two hundred fifty-two thousand, one hundred ninety-seven".