70400978 has 18 divisors (see below), whose sum is σ = 112501071. Its totient is φ = 33034944.

The previous prime is 70400963. The next prime is 70400989. The reversal of 70400978 is 87900407.

It can be written as a sum of positive squares in 5 ways, for example, as 66210769 + 4190209 = 8137^2 + 2047^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5933.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 201548 + ... + 201896.

Almost surely, 2^70400978 is an apocalyptic number.

70400978 is a deficient number, since it is larger than the sum of its proper divisors (42100093).

70400978 is an equidigital number, since it uses as much as digits as its factorization.

70400978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 70400978 is about 8390.5290655596. The cubic root of 70400978 is about 412.9139582380.

Multiplying 70400978 by its product of nonzero digits (14112), we get a square (993498601536 = 996744²).

The spelling of 70400978 in words is "seventy million, four hundred thousand, nine hundred seventy-eight".