78340990 has 128 divisors (see below), whose sum is σ = 191600640. Its totient is φ = 22353408.

The previous prime is 78340987. The next prime is 78340991. The reversal of 78340990 is 9904387.

It is a super-2 number, since 2×78340990² = 12274621428360200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78340991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 397572 + ... + 397768.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^78340990 is an apocalyptic number.

78340990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78340990 is an abundant number, since it is smaller than the sum of its proper divisors (113259650).

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

78340990 is a wasteful number, since it uses less digits than its factorization.

78340990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 78340990 is about 8851.0445711227. The cubic root of 78340990 is about 427.8875843872.

The spelling of 78340990 in words is "seventy-eight million, three hundred forty thousand, nine hundred ninety".