39778906666902 has 192 divisors, whose sum is σ = 90102173736960. Its totient is φ = 11688522393600.

The previous prime is 39778906666883. The next prime is 39778906666903. The reversal of 39778906666902 is 20966660987793.

It is a super-2 number, since 2×39778906666902² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39778906666903) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6498756402 + ... + 6498762522.

It is an arithmetic number, because the mean of its divisors is an integer number (469282154880).

Almost surely, 2^{39778906666902} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39778906666902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45051086868480).

39778906666902 is an abundant number, since it is smaller than the sum of its proper divisors (50323267070058).

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

39778906666902 is a wasteful number, since it uses less digits than its factorization.

39778906666902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8879 (or 8866 counting only the distinct ones).

The product of its (nonzero) digits is 2222131968, while the sum is 78.

The spelling of 39778906666902 in words is "thirty-nine trillion, seven hundred seventy-eight billion, nine hundred six million, six hundred sixty-six thousand, nine hundred two".