51235802394 has 32 divisors (see below), whose sum is σ = 117133862400. Its totient is φ = 14635868592.

The previous prime is 51235802381. The next prime is 51235802399. The reversal of 51235802394 is 49320853215.

It is a super-2 number, since 2×51235802394² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (51235802399) 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, 94537 + ... + 333779.

It is an arithmetic number, because the mean of its divisors is an integer number (3660433200).

Almost surely, 2^51235802394 is an apocalyptic number.

51235802394 is an abundant number, since it is smaller than the sum of its proper divisors (65898060006).

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

51235802394 is a wasteful number, since it uses less digits than its factorization.

51235802394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244354.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 51235802394 in words is "fifty-one billion, two hundred thirty-five million, eight hundred two thousand, three hundred ninety-four".