78769390 has 32 divisors (see below), whose sum is σ = 162961344. Its totient is φ = 26853120.

The previous prime is 78769351. The next prime is 78769403. The reversal of 78769390 is 9396787.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9562 + ... + 15778.

It is an arithmetic number, because the mean of its divisors is an integer number (5092542).

Almost surely, 2^78769390 is an apocalyptic number.

78769390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78769390 is an abundant number, since it is smaller than the sum of its proper divisors (84191954).

78769390 is a wasteful number, since it uses less digits than its factorization.

78769390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 78769390 is about 8875.2121101414. The cubic root of 78769390 is about 428.6661207166. Note that the first 3 decimals are identical.

The spelling of 78769390 in words is "seventy-eight million, seven hundred sixty-nine thousand, three hundred ninety".