31450971640 has 32 divisors (see below), whose sum is σ = 77197840560. Its totient is φ = 11436716800.

The previous prime is 31450971631. The next prime is 31450971641. The reversal of 31450971640 is 4617905413.

It is a super-3 number, since 3×31450971640³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 31450971593 and 31450971602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31450971641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35739301 + ... + 35740180.

Almost surely, 2^31450971640 is an apocalyptic number.

It is an amenable number.

31450971640 is an abundant number, since it is smaller than the sum of its proper divisors (45746868920).

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

31450971640 is a wasteful number, since it uses less digits than its factorization.

31450971640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71479503 (or 71479499 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 31450971640 in words is "thirty-one billion, four hundred fifty million, nine hundred seventy-one thousand, six hundred forty".