78990513 has 16 divisors (see below), whose sum is σ = 120531840. Its totient is φ = 45075456.

The previous prime is 78990497. The next prime is 78990529. The reversal of 78990513 is 31509987.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78990497) and next prime (78990529).

It is not a de Polignac number, because 78990513 - 2⁴ = 78990497 is a prime.

It is a super-2 number, since 2×78990513² = 12479002288006338, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78990563) 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 15 ways as a sum of consecutive naturals, for example, 16273 + ... + 20561.

It is an arithmetic number, because the mean of its divisors is an integer number (7533240).

Almost surely, 2^78990513 is an apocalyptic number.

It is an amenable number.

78990513 is a deficient number, since it is larger than the sum of its proper divisors (41541327).

78990513 is a wasteful number, since it uses less digits than its factorization.

78990513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 78990513 is about 8887.6607158464. The cubic root of 78990513 is about 429.0668659799.

The spelling of 78990513 in words is "seventy-eight million, nine hundred ninety thousand, five hundred thirteen".