78453490 has 8 divisors (see below), whose sum is σ = 141216300. Its totient is φ = 31381392.

The previous prime is 78453469. The next prime is 78453491. The reversal of 78453490 is 9435487.

It can be written as a sum of positive squares in 2 ways, for example, as 75394489 + 3059001 = 8683^2 + 1749^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78453491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3922665 + ... + 3922684.

Almost surely, 2^78453490 is an apocalyptic number.

78453490 is a deficient number, since it is larger than the sum of its proper divisors (62762810).

78453490 is a wasteful number, since it uses less digits than its factorization.

78453490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7845356.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78453490 is about 8857.3974732988. The cubic root of 78453490 is about 428.0923062039.

The spelling of 78453490 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred ninety".