78240274 has 32 divisors (see below), whose sum is σ = 138923136. Its totient is φ = 32348160.

The previous prime is 78240241. The next prime is 78240293. The reversal of 78240274 is 47204287.

It is a super-2 number, since 2×78240274² = 12243080951190152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 67282 + ... + 68434.

It is an arithmetic number, because the mean of its divisors is an integer number (4341348).

Almost surely, 2^78240274 is an apocalyptic number.

78240274 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78240274 is a deficient number, since it is larger than the sum of its proper divisors (60682862).

78240274 is a wasteful number, since it uses less digits than its factorization.

78240274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 78240274 is about 8845.3532433702. The cubic root of 78240274 is about 427.7041401605.

The spelling of 78240274 in words is "seventy-eight million, two hundred forty thousand, two hundred seventy-four".