78636490 has 32 divisors (see below), whose sum is σ = 143700480. Its totient is φ = 30980544.

The previous prime is 78636473. The next prime is 78636511. The reversal of 78636490 is 9463687.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352519 + ... + 352741.

It is an arithmetic number, because the mean of its divisors is an integer number (4490640).

Almost surely, 2^78636490 is an apocalyptic number.

78636490 is a deficient number, since it is larger than the sum of its proper divisors (65063990).

78636490 is a wasteful number, since it uses less digits than its factorization.

78636490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 78636490 is about 8867.7218043870. The cubic root of 78636490 is about 428.4249026607.

The spelling of 78636490 in words is "seventy-eight million, six hundred thirty-six thousand, four hundred ninety".