78057215946 has 32 divisors (see below), whose sum is σ = 183664039680. Its totient is φ = 24488538048.

The previous prime is 78057215941. The next prime is 78057215947. The reversal of 78057215946 is 64951275087.

It is a super-2 number, since 2×78057215946² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) 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 (54).

It is a junction number, because it is equal to n+sod(n) for n = 78057215892 and 78057215901.

It is not an unprimeable number, because it can be changed into a prime (78057215941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42513906 + ... + 42515741.

It is an arithmetic number, because the mean of its divisors is an integer number (5739501240).

Almost surely, 2^78057215946 is an apocalyptic number.

78057215946 is an abundant number, since it is smaller than the sum of its proper divisors (105606823734).

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

78057215946 is a wasteful number, since it uses less digits than its factorization.

78057215946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85029675 (or 85029669 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 78057215946 in words is "seventy-eight billion, fifty-seven million, two hundred fifteen thousand, nine hundred forty-six".