70399906 has 4 divisors (see below), whose sum is σ = 105599862. Its totient is φ = 35199952.

The previous prime is 70399897. The next prime is 70399913. The reversal of 70399906 is 60999307.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60999307 = 6679 ⋅9133.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 4644025 = 8109^2 + 2155^2 .

It is a super-2 number, since 2×70399906² = 9912293529617672, 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, 17599975 + ... + 17599978.

Almost surely, 2^70399906 is an apocalyptic number.

70399906 is a deficient number, since it is larger than the sum of its proper divisors (35199956).

70399906 is a wasteful number, since it uses less digits than its factorization.

70399906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35199955.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 70399906 is about 8390.4651837666. The cubic root of 70399906 is about 412.9118624053.

The spelling of 70399906 in words is "seventy million, three hundred ninety-nine thousand, nine hundred six".