65632978 has 4 divisors (see below), whose sum is σ = 98449470. Its totient is φ = 32816488.

The previous prime is 65632951. The next prime is 65632991. The reversal of 65632978 is 87923656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 38353249 + 27279729 = 6193^2 + 5223^2 .

It is a super-2 number, since 2×65632978² = 8615375602296968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16408243 + ... + 16408246.

Almost surely, 2^65632978 is an apocalyptic number.

65632978 is a deficient number, since it is larger than the sum of its proper divisors (32816492).

65632978 is a wasteful number, since it uses less digits than its factorization.

65632978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32816491.

The product of its digits is 544320, while the sum is 46.

The square root of 65632978 is about 8101.4182708955. The cubic root of 65632978 is about 403.3735061565.

The spelling of 65632978 in words is "sixty-five million, six hundred thirty-two thousand, nine hundred seventy-eight".