78531798 has 16 divisors (see below), whose sum is σ = 163892736. Its totient is φ = 25039080.

The previous prime is 78531787. The next prime is 78531799. The reversal of 78531798 is 89713587.

It is a super-2 number, since 2×78531798² = 12334486594225608, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531799) 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, 284398 + ... + 284673.

It is an arithmetic number, because the mean of its divisors is an integer number (10243296).

Almost surely, 2^78531798 is an apocalyptic number.

78531798 is an abundant number, since it is smaller than the sum of its proper divisors (85360938).

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

78531798 is a wasteful number, since it uses less digits than its factorization.

78531798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569099.

The product of its digits is 423360, while the sum is 48.

The square root of 78531798 is about 8861.8168566045. The cubic root of 78531798 is about 428.2346916473.

The spelling of 78531798 in words is "seventy-eight million, five hundred thirty-one thousand, seven hundred ninety-eight".