70038778 has 4 divisors (see below), whose sum is σ = 105058170. Its totient is φ = 35019388.

The previous prime is 70038767. The next prime is 70038781. The reversal of 70038778 is 87783007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87783007 = 13 ⋅6752539.

It can be written as a sum of positive squares in only one way, i.e., 58018689 + 12020089 = 7617^2 + 3467^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 70038778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17509693 + ... + 17509696.

Almost surely, 2^70038778 is an apocalyptic number.

70038778 is a deficient number, since it is larger than the sum of its proper divisors (35019392).

70038778 is a wasteful number, since it uses less digits than its factorization.

70038778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35019391.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 70038778 is about 8368.9173732329. The cubic root of 70038778 is about 412.2046184091.

The spelling of 70038778 in words is "seventy million, thirty-eight thousand, seven hundred seventy-eight".