70128778 has 8 divisors (see below), whose sum is σ = 107758980. Its totient is φ = 34209120.

The previous prime is 70128761. The next prime is 70128781. The reversal of 70128778 is 87782107.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45198729 + 24930049 = 6723^2 + 4993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70128778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427533 + ... + 427696.

Almost surely, 2^70128778 is an apocalyptic number.

70128778 is a deficient number, since it is larger than the sum of its proper divisors (37630202).

70128778 is a wasteful number, since it uses less digits than its factorization.

70128778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855272.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 70128778 is about 8374.2926865497. The cubic root of 70128778 is about 412.3811041481.

The spelling of 70128778 in words is "seventy million, one hundred twenty-eight thousand, seven hundred seventy-eight".