30505642 has 4 divisors (see below), whose sum is σ = 45758466. Its totient is φ = 15252820.

The previous prime is 30505639. The next prime is 30505661. The reversal of 30505642 is 24650503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24650503 = 23 ⋅1071761.

It can be written as a sum of positive squares in only one way, i.e., 17480761 + 13024881 = 4181^2 + 3609^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7626409 + ... + 7626412.

Almost surely, 2^30505642 is an apocalyptic number.

30505642 is a deficient number, since it is larger than the sum of its proper divisors (15252824).

30505642 is a wasteful number, since it uses less digits than its factorization.

30505642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15252823.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 30505642 is about 5523.1912876525. The cubic root of 30505642 is about 312.4592527138.

The spelling of 30505642 in words is "thirty million, five hundred five thousand, six hundred forty-two".