70428387 has 4 divisors (see below), whose sum is σ = 93904520. Its totient is φ = 46952256.

The previous prime is 70428377. The next prime is 70428431. The reversal of 70428387 is 78382407.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 70428387 - 2¹⁴ = 70412003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70428377) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11738062 + ... + 11738067.

It is an arithmetic number, because the mean of its divisors is an integer number (23476130).

Almost surely, 2^70428387 is an apocalyptic number.

70428387 is a deficient number, since it is larger than the sum of its proper divisors (23476133).

70428387 is a wasteful number, since it uses less digits than its factorization.

70428387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23476132.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 70428387 is about 8392.1622362774. The cubic root of 70428387 is about 412.9675374665.

The spelling of 70428387 in words is "seventy million, four hundred twenty-eight thousand, three hundred eighty-seven".