78173830 has 32 divisors (see below), whose sum is σ = 161538624. Its totient is φ = 26681856.

The previous prime is 78173827. The next prime is 78173833. The reversal of 78173830 is 3837187.

It is an interprime number because it is at equal distance from previous prime (78173827) and next prime (78173833).

It is a super-2 number, since 2×78173830² = 12222295393737800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78173830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78173833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13914 + ... + 18706.

It is an arithmetic number, because the mean of its divisors is an integer number (5048082).

Almost surely, 2^78173830 is an apocalyptic number.

78173830 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78173830 is an abundant number, since it is smaller than the sum of its proper divisors (83364794).

78173830 is a wasteful number, since it uses less digits than its factorization.

78173830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 78173830 is about 8841.5965752798. The cubic root of 78173830 is about 427.5830327869.

It can be divided in two parts, 78173 and 830, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 78173830 in words is "seventy-eight million, one hundred seventy-three thousand, eight hundred thirty".