78274634 has 4 divisors (see below), whose sum is σ = 117411954. Its totient is φ = 39137316.

The previous prime is 78274633. The next prime is 78274639. The reversal of 78274634 is 43647287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52519009 + 25755625 = 7247^2 + 5075^2 .

It is a super-2 number, since 2×78274634² = 12253836655667912, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78274591 and 78274600.

It is not an unprimeable number, because it can be changed into a prime (78274633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19568657 + ... + 19568660.

Almost surely, 2^78274634 is an apocalyptic number.

78274634 is a deficient number, since it is larger than the sum of its proper divisors (39137320).

78274634 is a wasteful number, since it uses less digits than its factorization.

78274634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39137319.

The product of its digits is 225792, while the sum is 41.

The square root of 78274634 is about 8847.2952929130. The cubic root of 78274634 is about 427.7667411831.

The spelling of 78274634 in words is "seventy-eight million, two hundred seventy-four thousand, six hundred thirty-four".