71990946 has 12 divisors (see below), whose sum is σ = 155980422. Its totient is φ = 23996976.

The previous prime is 71990929. The next prime is 71990969. The reversal of 71990946 is 64909917.

It can be written as a sum of positive squares in only one way, i.e., 56475225 + 15515721 = 7515^2 + 3939^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1999731 + ... + 1999766.

Almost surely, 2^71990946 is an apocalyptic number.

71990946 is an abundant number, since it is smaller than the sum of its proper divisors (83989476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71990946 is a wasteful number, since it uses less digits than its factorization.

71990946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999505 (or 3999502 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 71990946 is about 8484.7478453988. The cubic root of 71990946 is about 415.9993258433. Note that the first 3 decimals are identical.

The spelling of 71990946 in words is "seventy-one million, nine hundred ninety thousand, nine hundred forty-six".