78494840 has 32 divisors (see below), whose sum is σ = 177094080. Its totient is φ = 31312512.

The previous prime is 78494809. The next prime is 78494863. The reversal of 78494840 is 4849487.

It is a super-2 number, since 2×78494840² = 12322879813251200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78494791 and 78494800.

It is a congruent number.

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, 13409 + ... + 18351.

It is an arithmetic number, because the mean of its divisors is an integer number (5534190).

Almost surely, 2^78494840 is an apocalyptic number.

It is an amenable number.

78494840 is an abundant number, since it is smaller than the sum of its proper divisors (98599240).

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

78494840 is a wasteful number, since it uses less digits than its factorization.

78494840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351 (or 5347 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 78494840 is about 8859.7313729029. The cubic root of 78494840 is about 428.1675036566.

The spelling of 78494840 in words is "seventy-eight million, four hundred ninety-four thousand, eight hundred forty".