78420298 has 16 divisors (see below), whose sum is σ = 129951360. Its totient is φ = 35193600.

The previous prime is 78420257. The next prime is 78420301. The reversal of 78420298 is 89202487.

It is a super-2 number, since 2×78420298² = 12299486276817608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78420298.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20823 + ... + 24298.

It is an arithmetic number, because the mean of its divisors is an integer number (8121960).

Almost surely, 2^78420298 is an apocalyptic number.

78420298 is a deficient number, since it is larger than the sum of its proper divisors (51531062).

78420298 is a wasteful number, since it uses less digits than its factorization.

78420298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45213.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78420298 is about 8855.5235870049. The cubic root of 78420298 is about 428.0319254434.

The spelling of 78420298 in words is "seventy-eight million, four hundred twenty thousand, two hundred ninety-eight".