78690780 has 216 divisors, whose sum is σ = 289572192. Its totient is φ = 16941312.

The previous prime is 78690779. The next prime is 78690809. The reversal of 78690780 is 8709687.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 454774 + ... + 454946.

It is an arithmetic number, because the mean of its divisors is an integer number (1340612).

Almost surely, 2^78690780 is an apocalyptic number.

78690780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78690780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144786096).

78690780 is an abundant number, since it is smaller than the sum of its proper divisors (210881412).

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

78690780 is a wasteful number, since it uses less digits than its factorization.

78690780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 78690780 is about 8870.7823781220. The cubic root of 78690780 is about 428.5234736819.

The spelling of 78690780 in words is "seventy-eight million, six hundred ninety thousand, seven hundred eighty".