78220998 has 32 divisors (see below), whose sum is σ = 179435520. Its totient is φ = 25232040.

The previous prime is 78220991. The next prime is 78221047. The reversal of 78220998 is 89902287.

It is a super-2 number, since 2×78220998² = 12237049056232008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78220991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21690 + ... + 25037.

It is an arithmetic number, because the mean of its divisors is an integer number (5607360).

Almost surely, 2^78220998 is an apocalyptic number.

78220998 is an abundant number, since it is smaller than the sum of its proper divisors (101214522).

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

78220998 is a wasteful number, since it uses less digits than its factorization.

78220998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46769 (or 46763 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 78220998 is about 8844.2635645937. The cubic root of 78220998 is about 427.6690128885.

The spelling of 78220998 in words is "seventy-eight million, two hundred twenty thousand, nine hundred ninety-eight".