31003023440 has 40 divisors (see below), whose sum is σ = 72103465440. Its totient is φ = 12397521536.

The previous prime is 31003023433. The next prime is 31003023479. The reversal of 31003023440 is 4432030013.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×31003023440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221471 + ... + 333249.

It is an arithmetic number, because the mean of its divisors is an integer number (1802586636).

Almost surely, 2^31003023440 is an apocalyptic number.

It is an amenable number.

31003023440 is an abundant number, since it is smaller than the sum of its proper divisors (41100442000).

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

31003023440 is a wasteful number, since it uses less digits than its factorization.

31003023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115259 (or 115253 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31003023440 its reverse (4432030013), we get a palindrome (35435053453).

The spelling of 31003023440 in words is "thirty-one billion, three million, twenty-three thousand, four hundred forty".