65429978 has 4 divisors (see below), whose sum is σ = 98144970. Its totient is φ = 32714988.

The previous prime is 65429971. The next prime is 65429981. The reversal of 65429978 is 87992456.

It is a happy number.

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., 36517849 + 28912129 = 6043^2 + 5377^2 .

It is a super-3 number, since 3×65429978³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (65429971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16357493 + ... + 16357496.

Almost surely, 2^65429978 is an apocalyptic number.

65429978 is a deficient number, since it is larger than the sum of its proper divisors (32714992).

65429978 is a wasteful number, since it uses less digits than its factorization.

65429978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32714991.

The product of its digits is 1088640, while the sum is 50.

The square root of 65429978 is about 8088.8798977362. The cubic root of 65429978 is about 402.9572043130.

The spelling of 65429978 in words is "sixty-five million, four hundred twenty-nine thousand, nine hundred seventy-eight".