309978060 has 48 divisors (see below), whose sum is σ = 991931136. Its totient is φ = 70852032.

The previous prime is 309978049. The next prime is 309978077. The reversal of 309978060 is 60879903.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368602 + ... + 369441.

It is an arithmetic number, because the mean of its divisors is an integer number (20665232).

Almost surely, 2^309978060 is an apocalyptic number.

309978060 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309978060 is an abundant number, since it is smaller than the sum of its proper divisors (681953076).

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

309978060 is a wasteful number, since it uses less digits than its factorization.

309978060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738062 (or 738060 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 309978060 is about 17606.1937965024. The cubic root of 309978060 is about 676.7739784132.

The spelling of 309978060 in words is "three hundred nine million, nine hundred seventy-eight thousand, sixty".