78861406 has 32 divisors (see below), whose sum is σ = 131090400. Its totient is φ = 35356800.

The previous prime is 78861397. The next prime is 78861407. The reversal of 78861406 is 60416887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78861407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154680 + ... + 155188.

It is an arithmetic number, because the mean of its divisors is an integer number (4096575).

Almost surely, 2^78861406 is an apocalyptic number.

78861406 is a deficient number, since it is larger than the sum of its proper divisors (52228994).

78861406 is a wasteful number, since it uses less digits than its factorization.

78861406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78861406 is about 8880.3944732202. The cubic root of 78861406 is about 428.8329739937.

The spelling of 78861406 in words is "seventy-eight million, eight hundred sixty-one thousand, four hundred six".