78416380 has 24 divisors (see below), whose sum is σ = 188199648. Its totient is φ = 26885568.

The previous prime is 78416347. The next prime is 78416399. The reversal of 78416380 is 8361487.

It is a happy number.

It is a super-2 number, since 2×78416380² = 12298257304608800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279919 + ... + 280198.

It is an arithmetic number, because the mean of its divisors is an integer number (7841652).

Almost surely, 2^78416380 is an apocalyptic number.

78416380 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78416380 is an abundant number, since it is smaller than the sum of its proper divisors (109783268).

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

78416380 is a wasteful number, since it uses less digits than its factorization.

78416380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560133 (or 560131 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 78416380 is about 8855.3023663791. The cubic root of 78416380 is about 428.0247969445.

The spelling of 78416380 in words is "seventy-eight million, four hundred sixteen thousand, three hundred eighty".