309916061040 has 40 divisors (see below), whose sum is σ = 960739789968. Its totient is φ = 82644282880.

The previous prime is 309916060999. The next prime is 309916061041. The reversal of 309916061040 is 40160619903.

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

It is a self number, because there is not a number n which added to its sum of digits gives 309916061040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309916061041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645658221 + ... + 645658700.

Almost surely, 2^309916061040 is an apocalyptic number.

309916061040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309916061040 is an abundant number, since it is smaller than the sum of its proper divisors (650823728928).

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

309916061040 is a wasteful number, since it uses less digits than its factorization.

309916061040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291316937 (or 1291316931 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The spelling of 309916061040 in words is "three hundred nine billion, nine hundred sixteen million, sixty-one thousand, forty".