30478761 has 14 divisors (see below), whose sum is σ = 45698330. Its totient is φ = 20318688.

The previous prime is 30478759. The next prime is 30478823. The reversal of 30478761 is 16787403.

It can be written as a sum of positive squares in only one way, i.e., 23619600 + 6859161 = 4860^2 + 2619^2 .

It is not a de Polignac number, because 30478761 - 2¹ = 30478759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30478561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 20176 + ... + 21633.

Almost surely, 2^30478761 is an apocalyptic number.

It is an amenable number.

30478761 is a deficient number, since it is larger than the sum of its proper divisors (15219569).

30478761 is an frugal number, since it uses more digits than its factorization.

30478761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41827 (or 41812 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 30478761 is about 5520.7572850108. The cubic root of 30478761 is about 312.3674479972.

The spelling of 30478761 in words is "thirty million, four hundred seventy-eight thousand, seven hundred sixty-one".