71620839394 has 64 divisors (see below), whose sum is σ = 120216950784. Its totient is φ = 31786546176.

The previous prime is 71620839391. The next prime is 71620839449. The reversal of 71620839394 is 49393802617.

It is a super-2 number, since 2×71620839394² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71620839391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50330167 + ... + 50331589.

It is an arithmetic number, because the mean of its divisors is an integer number (1878389856).

Almost surely, 2^71620839394 is an apocalyptic number.

71620839394 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

71620839394 is a deficient number, since it is larger than the sum of its proper divisors (48596111390).

71620839394 is a wasteful number, since it uses less digits than its factorization.

71620839394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 71620839394 in words is "seventy-one billion, six hundred twenty million, eight hundred thirty-nine thousand, three hundred ninety-four".