78344590 has 8 divisors (see below), whose sum is σ = 141020280. Its totient is φ = 31337832.

The previous prime is 78344587. The next prime is 78344593. The reversal of 78344590 is 9544387.

It is an interprime number because it is at equal distance from previous prime (78344587) and next prime (78344593).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78344590² = 12275749564536200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78344593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3917220 + ... + 3917239.

It is an arithmetic number, because the mean of its divisors is an integer number (17627535).

Almost surely, 2^78344590 is an apocalyptic number.

78344590 is a deficient number, since it is larger than the sum of its proper divisors (62675690).

78344590 is a wasteful number, since it uses less digits than its factorization.

78344590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7834466.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78344590 is about 8851.2479346135. The cubic root of 78344590 is about 427.8941385198.

The spelling of 78344590 in words is "seventy-eight million, three hundred forty-four thousand, five hundred ninety".