30642261 has 32 divisors (see below), whose sum is σ = 45749760. Its totient is φ = 18123264.

The previous prime is 30642247. The next prime is 30642263. The reversal of 30642261 is 16224603.

It is not a de Polignac number, because 30642261 - 2⁶ = 30642197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30642263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133695 + ... + 133923.

It is an arithmetic number, because the mean of its divisors is an integer number (1429680).

Almost surely, 2^30642261 is an apocalyptic number.

It is an amenable number.

30642261 is a deficient number, since it is larger than the sum of its proper divisors (15107499).

30642261 is a wasteful number, since it uses less digits than its factorization.

30642261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 30642261 is about 5535.5452305983. The cubic root of 30642261 is about 312.9250059352.

Adding to 30642261 its reverse (16224603), we get a palindrome (46866864).

It can be divided in two parts, 30642 and 261, that added together give a palindrome (30903).

The spelling of 30642261 in words is "thirty million, six hundred forty-two thousand, two hundred sixty-one".