78297492 has 72 divisors (see below), whose sum is σ = 228891936. Its totient is φ = 20647872.

The previous prime is 78297491. The next prime is 78297503. The reversal of 78297492 is 29479287.

It is a super-2 number, since 2×78297492² = 12260994506980128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2523 + ... + 12765.

Almost surely, 2^78297492 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 78297492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114445968).

78297492 is an abundant number, since it is smaller than the sum of its proper divisors (150594444).

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

78297492 is a wasteful number, since it uses less digits than its factorization.

78297492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277 (or 10268 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 78297492 is about 8848.5870058445. The cubic root of 78297492 is about 427.8083763849.

The spelling of 78297492 in words is "seventy-eight million, two hundred ninety-seven thousand, four hundred ninety-two".