78424780 has 48 divisors (see below), whose sum is σ = 198132480. Its totient is φ = 25472448.

The previous prime is 78424763. The next prime is 78424813. The reversal of 78424780 is 8742487.

It is a happy number.

It is a super-2 number, since 2×78424780² = 12300892236096800, which contains 22 as substring.

It is an unprimeable number.

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, 12082 + ... + 17401.

It is an arithmetic number, because the mean of its divisors is an integer number (4127760).

Almost surely, 2^78424780 is an apocalyptic number.

78424780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78424780 is an abundant number, since it is smaller than the sum of its proper divisors (119707700).

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

78424780 is a wasteful number, since it uses less digits than its factorization.

78424780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29518 (or 29516 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 78424780 is about 8855.7766457832. The cubic root of 78424780 is about 428.0400798056.

The spelling of 78424780 in words is "seventy-eight million, four hundred twenty-four thousand, seven hundred eighty".