7816212638 has 32 divisors (see below), whose sum is σ = 13552098336. Its totient is φ = 3348753408.

The previous prime is 7816212619. The next prime is 7816212643. The reversal of 7816212638 is 8362126187.

It is a super-2 number, since 2×7816212638² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 88856 + ... + 153387.

It is an arithmetic number, because the mean of its divisors is an integer number (423503073).

Almost surely, 2^7816212638 is an apocalyptic number.

7816212638 is a deficient number, since it is larger than the sum of its proper divisors (5735885698).

7816212638 is a wasteful number, since it uses less digits than its factorization.

7816212638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242348.

The product of its digits is 193536, while the sum is 44.

The square root of 7816212638 is about 88409.3470058455. The cubic root of 7816212638 is about 1984.5655822753.

The spelling of 7816212638 in words is "seven billion, eight hundred sixteen million, two hundred twelve thousand, six hundred thirty-eight".