78204831 has 16 divisors (see below), whose sum is σ = 106977024. Its totient is φ = 50791104.

The previous prime is 78204809. The next prime is 78204857. The reversal of 78204831 is 13840287.

It is not a de Polignac number, because 78204831 - 2⁵ = 78204799 is a prime.

It is a super-2 number, since 2×78204831² = 12231991183477122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78204792 and 78204801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78204871) 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, 82995 + ... + 83931.

It is an arithmetic number, because the mean of its divisors is an integer number (6686064).

Almost surely, 2^78204831 is an apocalyptic number.

78204831 is a deficient number, since it is larger than the sum of its proper divisors (28772193).

78204831 is a wasteful number, since it uses less digits than its factorization.

78204831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 78204831 is about 8843.3495351026. The cubic root of 78204831 is about 427.6395467966.

The spelling of 78204831 in words is "seventy-eight million, two hundred four thousand, eight hundred thirty-one".