31798728400 has 30 divisors (see below), whose sum is σ = 76396445942. Its totient is φ = 12719491200.

The previous prime is 31798728359. The next prime is 31798728419. The reversal of 31798728400 is 482789713.

It can be written as a sum of positive squares in 3 ways, for example, as 7629673104 + 24169055296 = 87348^2 + 155464^2 .

It is a super-2 number, since 2×31798728400² (a number of 22 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 5 ways as a sum of consecutive naturals, for example, 39748011 + ... + 39748810.

Almost surely, 2^31798728400 is an apocalyptic number.

It is an amenable number.

31798728400 is an abundant number, since it is smaller than the sum of its proper divisors (44597717542).

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

31798728400 is a wasteful number, since it uses less digits than its factorization.

31798728400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79496839 (or 79496828 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 31798728400 in words is "thirty-one billion, seven hundred ninety-eight million, seven hundred twenty-eight thousand, four hundred".