39778628 has 12 divisors (see below), whose sum is σ = 73276560. Its totient is φ = 18842472.

The previous prime is 39778621. The next prime is 39778643. The reversal of 39778628 is 82687793.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (39778621) 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, 261626 + ... + 261777.

It is an arithmetic number, because the mean of its divisors is an integer number (6106380).

Almost surely, 2^39778628 is an apocalyptic number.

39778628 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

39778628 is a deficient number, since it is larger than the sum of its proper divisors (33497932).

39778628 is a wasteful number, since it uses less digits than its factorization.

39778628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523426 (or 523424 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The square root of 39778628 is about 6307.0300459091. The cubic root of 39778628 is about 341.3631205525.

The spelling of 39778628 in words is "thirty-nine million, seven hundred seventy-eight thousand, six hundred twenty-eight".