78420196 has 6 divisors (see below), whose sum is σ = 137235350. Its totient is φ = 39210096.

The previous prime is 78420187. The next prime is 78420203. The reversal of 78420196 is 69102487.

78420196 = T₇₂₂₉ + T₇₂₃₀ + T₇₂₃₁.

It can be written as a sum of positive squares in only one way, i.e., 76317696 + 2102500 = 8736^2 + 1450^2 .

It is a super-2 number, since 2×78420196² = 12299454281356832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9802521 + ... + 9802528.

Almost surely, 2^78420196 is an apocalyptic number.

78420196 is the 7231-st centered triangular number.

It is an amenable number.

78420196 is a deficient number, since it is larger than the sum of its proper divisors (58815154).

78420196 is a wasteful number, since it uses less digits than its factorization.

78420196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19605053 (or 19605051 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 78420196 is about 8855.5178278856. The cubic root of 78420196 is about 428.0317398653.

The spelling of 78420196 in words is "seventy-eight million, four hundred twenty thousand, one hundred ninety-six".