78052490 has 16 divisors (see below), whose sum is σ = 141739848. Its totient is φ = 30944256.

The previous prime is 78052433. The next prime is 78052493. The reversal of 78052490 is 9425087.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42994249 + 35058241 = 6557^2 + 5921^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78052490.

It is not an unprimeable number, because it can be changed into a prime (78052493) 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, 33407 + ... + 35666.

Almost surely, 2^78052490 is an apocalyptic number.

78052490 is a deficient number, since it is larger than the sum of its proper divisors (63687358).

78052490 is a wasteful number, since it uses less digits than its factorization.

78052490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69193.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78052490 is about 8834.7320276282. The cubic root of 78052490 is about 427.3616893515.

The spelling of 78052490 in words is "seventy-eight million, fifty-two thousand, four hundred ninety".