71632978 has 8 divisors (see below), whose sum is σ = 107491068. Its totient is φ = 35802624.

The previous prime is 71632973. The next prime is 71632991. The reversal of 71632978 is 87923617.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71622369 + 10609 = 8463^2 + 103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×71632978⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (71632973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650 + ... + 12082.

Almost surely, 2^71632978 is an apocalyptic number.

71632978 is a deficient number, since it is larger than the sum of its proper divisors (35858090).

71632978 is a wasteful number, since it uses less digits than its factorization.

71632978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13868.

The product of its digits is 127008, while the sum is 43.

The square root of 71632978 is about 8463.6267639824. The cubic root of 71632978 is about 415.3086744029.

The spelling of 71632978 in words is "seventy-one million, six hundred thirty-two thousand, nine hundred seventy-eight".