78489272 has 32 divisors (see below), whose sum is σ = 160859520. Its totient is φ = 35742720.

The previous prime is 78489259. The next prime is 78489277. The reversal of 78489272 is 27298487.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78489277) 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, 5093 + ... + 13524.

It is an arithmetic number, because the mean of its divisors is an integer number (5026860).

Almost surely, 2^78489272 is an apocalyptic number.

It is an amenable number.

78489272 is an abundant number, since it is smaller than the sum of its proper divisors (82370248).

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

78489272 is a wasteful number, since it uses less digits than its factorization.

78489272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671 (or 18667 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 78489272 is about 8859.4171365841. The cubic root of 78489272 is about 428.1573794538.

It can be divided in two parts, 78 and 489272, that multiplied together give a triangular number (38163216 = T₈₇₃₆).

The spelling of 78489272 in words is "seventy-eight million, four hundred eighty-nine thousand, two hundred seventy-two".