78361418 has 4 divisors (see below), whose sum is σ = 117542130. Its totient is φ = 39180708.

The previous prime is 78361363. The next prime is 78361427. The reversal of 78361418 is 81416387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 74252689 + 4108729 = 8617^2 + 2027^2 .

It is a super-2 number, since 2×78361418² = 12281023661941448, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19590353 + ... + 19590356.

Almost surely, 2^78361418 is an apocalyptic number.

78361418 is a deficient number, since it is larger than the sum of its proper divisors (39180712).

78361418 is a wasteful number, since it uses less digits than its factorization.

78361418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39180711.

The product of its digits is 32256, while the sum is 38.

The square root of 78361418 is about 8852.1984839925. The cubic root of 78361418 is about 427.9247727860.

The spelling of 78361418 in words is "seventy-eight million, three hundred sixty-one thousand, four hundred eighteen".