30691972 has 6 divisors (see below), whose sum is σ = 53710958. Its totient is φ = 15345984.

The previous prime is 30691961. The next prime is 30691979. The reversal of 30691972 is 27919603.

It can be written as a sum of positive squares in only one way, i.e., 26873856 + 3818116 = 5184^2 + 1954^2 .

It is not an unprimeable number, because it can be changed into a prime (30691979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3836493 + ... + 3836500.

Almost surely, 2^30691972 is an apocalyptic number.

It is an amenable number.

30691972 is a deficient number, since it is larger than the sum of its proper divisors (23018986).

30691972 is a wasteful number, since it uses less digits than its factorization.

30691972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672997 (or 7672995 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 30691972 is about 5540.0335739055. The cubic root of 30691972 is about 313.0941341257.

It can be divided in two parts, 3069 and 1972, that added together give a square (5041 = 71²).

The spelling of 30691972 in words is "thirty million, six hundred ninety-one thousand, nine hundred seventy-two".