78402198 has 32 divisors (see below), whose sum is σ = 189748224. Its totient is φ = 21082752.

The previous prime is 78402187. The next prime is 78402199. The reversal of 78402198 is 89120487.

It is a super-2 number, since 2×78402198² = 12293809302462408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78402199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54190 + ... + 55617.

It is an arithmetic number, because the mean of its divisors is an integer number (5929632).

Almost surely, 2^78402198 is an apocalyptic number.

78402198 is an abundant number, since it is smaller than the sum of its proper divisors (111346026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78402198 is a wasteful number, since it uses less digits than its factorization.

78402198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109836.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 78402198 is about 8854.5015669997. The cubic root of 78402198 is about 427.9989919038.

The spelling of 78402198 in words is "seventy-eight million, four hundred two thousand, one hundred ninety-eight".