7864836 has 24 divisors (see below), whose sum is σ = 20973120. Its totient is φ = 2247072.

The previous prime is 7864823. The next prime is 7864837. The reversal of 7864836 is 6384687.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

It is a d-powerful number, because it can be written as 7⁸ + 8 + 6³ + 4⁴ + 8⁷ + 3⁷ + 6³ .

It is not an unprimeable number, because it can be changed into a prime (7864837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46731 + ... + 46898.

It is an arithmetic number, because the mean of its divisors is an integer number (873880).

Almost surely, 2^7864836 is an apocalyptic number.

It is an amenable number.

7864836 is an abundant number, since it is smaller than the sum of its proper divisors (13108284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7864836 is a wasteful number, since it uses less digits than its factorization.

7864836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93643 (or 93641 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 7864836 is about 2804.4314931907. The cubic root of 7864836 is about 198.8672296023.

The spelling of 7864836 in words is "seven million, eight hundred sixty-four thousand, eight hundred thirty-six".