78662780 has 48 divisors (see below), whose sum is σ = 189428736. Its totient is φ = 26879040.

The previous prime is 78662743. The next prime is 78662789. The reversal of 78662780 is 8726687.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78662789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50615 + ... + 52145.

It is an arithmetic number, because the mean of its divisors is an integer number (3946432).

Almost surely, 2^78662780 is an apocalyptic number.

78662780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78662780 is an abundant number, since it is smaller than the sum of its proper divisors (110765956).

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

78662780 is a wasteful number, since it uses less digits than its factorization.

78662780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 78662780 is about 8869.2040229098. The cubic root of 78662780 is about 428.4726414638.

The spelling of 78662780 in words is "seventy-eight million, six hundred sixty-two thousand, seven hundred eighty".