78038172 has 54 divisors (see below), whose sum is σ = 206512488. Its totient is φ = 24800688.

The previous prime is 78038171. The next prime is 78038173. The reversal of 78038172 is 27183087.

It is an interprime number because it is at equal distance from previous prime (78038171) and next prime (78038173).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78038171) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 254043 + ... + 254349.

Almost surely, 2^78038172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78038172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103256244).

78038172 is an abundant number, since it is smaller than the sum of its proper divisors (128474316).

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

78038172 is a wasteful number, since it uses less digits than its factorization.

78038172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78038172 is about 8833.9216659420. The cubic root of 78038172 is about 427.3355559172.

It can be divided in two parts, 78038 and 172, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 78038172 in words is "seventy-eight million, thirty-eight thousand, one hundred seventy-two".