38778690 has 64 divisors (see below), whose sum is σ = 99449856. Its totient is φ = 9653952.

The previous prime is 38778673. The next prime is 38778767. The reversal of 38778690 is 9687783.

It is a super-2 number, since 2×38778690² = 3007573596232200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29017 + ... + 30323.

It is an arithmetic number, because the mean of its divisors is an integer number (1553904).

Almost surely, 2^38778690 is an apocalyptic number.

38778690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 38778690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49724928).

38778690 is an abundant number, since it is smaller than the sum of its proper divisors (60671166).

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

38778690 is a wasteful number, since it uses less digits than its factorization.

38778690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 38778690 is about 6227.2538088631. The cubic root of 38778690 is about 338.4784664266.

The spelling of 38778690 in words is "thirty-eight million, seven hundred seventy-eight thousand, six hundred ninety".