78344340 has 24 divisors (see below), whose sum is σ = 219364320. Its totient is φ = 20891808.

The previous prime is 78344309. The next prime is 78344351. The reversal of 78344340 is 4344387.

It is a super-2 number, since 2×78344340² = 12275671220071200, 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, 652810 + ... + 652929.

It is an arithmetic number, because the mean of its divisors is an integer number (9140180).

Almost surely, 2^78344340 is an apocalyptic number.

It is an amenable number.

78344340 is an abundant number, since it is smaller than the sum of its proper divisors (141019980).

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

78344340 is a wasteful number, since it uses less digits than its factorization.

78344340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305751 (or 1305749 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 78344340 is about 8851.2338122998. The cubic root of 78344340 is about 427.8936833782.

The spelling of 78344340 in words is "seventy-eight million, three hundred forty-four thousand, three hundred forty".