78831406 has 4 divisors (see below), whose sum is σ = 118247112. Its totient is φ = 39415702.

The previous prime is 78831391. The next prime is 78831413. The reversal of 78831406 is 60413887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19707850 + ... + 19707853.

It is an arithmetic number, because the mean of its divisors is an integer number (29561778).

Almost surely, 2^78831406 is an apocalyptic number.

78831406 is a deficient number, since it is larger than the sum of its proper divisors (39415706).

78831406 is a wasteful number, since it uses less digits than its factorization.

78831406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39415705.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 78831406 is about 8878.7051983946. The cubic root of 78831406 is about 428.7785890436.

The spelling of 78831406 in words is "seventy-eight million, eight hundred thirty-one thousand, four hundred six".