78140349 has 24 divisors (see below), whose sum is σ = 134665920. Its totient is φ = 44650872.

The previous prime is 78140341. The next prime is 78140371. The reversal of 78140349 is 94304187.

It is a happy number.

It is not a de Polignac number, because 78140349 - 2³ = 78140341 is a prime.

It is a super-2 number, since 2×78140349² = 12211828283683602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78140341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28209 + ... + 30854.

It is an arithmetic number, because the mean of its divisors is an integer number (5611080).

Almost surely, 2^78140349 is an apocalyptic number.

It is an amenable number.

78140349 is a deficient number, since it is larger than the sum of its proper divisors (56525571).

78140349 is a wasteful number, since it uses less digits than its factorization.

78140349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59086 (or 59073 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 78140349 is about 8839.7029927481. The cubic root of 78140349 is about 427.5219810181.

The spelling of 78140349 in words is "seventy-eight million, one hundred forty thousand, three hundred forty-nine".