38890778 has 4 divisors (see below), whose sum is σ = 58336170. Its totient is φ = 19445388.

The previous prime is 38890763. The next prime is 38890783. The reversal of 38890778 is 87709883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87709883 = 127 ⋅690629.

It can be written as a sum of positive squares in only one way, i.e., 37982569 + 908209 = 6163^2 + 953^2 .

It is a super-2 number, since 2×38890778² = 3024985226890568, 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, 9722693 + ... + 9722696.

Almost surely, 2^38890778 is an apocalyptic number.

38890778 is a deficient number, since it is larger than the sum of its proper divisors (19445392).

38890778 is a wasteful number, since it uses less digits than its factorization.

38890778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19445391.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 38890778 is about 6236.2471086383. The cubic root of 38890778 is about 338.8042714751.

The spelling of 38890778 in words is "thirty-eight million, eight hundred ninety thousand, seven hundred seventy-eight".