78821956 has 24 divisors (see below), whose sum is σ = 145496960. Its totient is φ = 37260000.

The previous prime is 78821947. The next prime is 78821957. The reversal of 78821956 is 65912887.

It is not an unprimeable number, because it can be changed into a prime (78821957) 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, 56386 + ... + 57766.

Almost surely, 2^78821956 is an apocalyptic number.

78821956 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78821956 is a deficient number, since it is larger than the sum of its proper divisors (66675004).

78821956 is a wasteful number, since it uses less digits than its factorization.

78821956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155 (or 2153 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 78821956 is about 8878.1730102539. The cubic root of 78821956 is about 428.7614549266.

The spelling of 78821956 in words is "seventy-eight million, eight hundred twenty-one thousand, nine hundred fifty-six".