30640378 has 4 divisors (see below), whose sum is σ = 45960570. Its totient is φ = 15320188.

The previous prime is 30640367. The next prime is 30640397. The reversal of 30640378 is 87304603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87304603 = 61 ⋅1431223.

It can be written as a sum of positive squares in only one way, i.e., 28121809 + 2518569 = 5303^2 + 1587^2 .

It is a Smith number, since the sum of its digits (31) 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 as a sum of consecutive naturals, namely, 7660093 + ... + 7660096.

Almost surely, 2^30640378 is an apocalyptic number.

30640378 is a deficient number, since it is larger than the sum of its proper divisors (15320192).

30640378 is a wasteful number, since it uses less digits than its factorization.

30640378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15320191.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 30640378 is about 5535.3751453718. The cubic root of 30640378 is about 312.9185959441.

The spelling of 30640378 in words is "thirty million, six hundred forty thousand, three hundred seventy-eight".