78400486 has 16 divisors (see below), whose sum is σ = 118803024. Its totient is φ = 38801824.

The previous prime is 78400477. The next prime is 78400489. The reversal of 78400486 is 68400487.

It is a super-2 number, since 2×78400486² = 12293272410072392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78400489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119736 + ... + 120388.

It is an arithmetic number, because the mean of its divisors is an integer number (7425189).

Almost surely, 2^78400486 is an apocalyptic number.

78400486 is a deficient number, since it is larger than the sum of its proper divisors (40402538).

78400486 is a wasteful number, since it uses less digits than its factorization.

78400486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 78400486 is about 8854.4048924815. The cubic root of 78400486 is about 427.9958766016.

Subtracting from 78400486 its reverse (68400487), we obtain a palindrome (9999999).

The spelling of 78400486 in words is "seventy-eight million, four hundred thousand, four hundred eighty-six".