70771978 has 4 divisors (see below), whose sum is σ = 106157970. Its totient is φ = 35385988.

The previous prime is 70771973. The next prime is 70771991. The reversal of 70771978 is 87917707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87917707 = 23 ⋅3822509.

It can be written as a sum of positive squares in only one way, i.e., 45198729 + 25573249 = 6723^2 + 5057^2 .

It is not an unprimeable number, because it can be changed into a prime (70771973) 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 as a sum of consecutive naturals, namely, 17692993 + ... + 17692996.

Almost surely, 2^70771978 is an apocalyptic number.

70771978 is a deficient number, since it is larger than the sum of its proper divisors (35385992).

70771978 is a wasteful number, since it uses less digits than its factorization.

70771978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35385991.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 70771978 is about 8412.6082756776. The cubic root of 70771978 is about 413.6380143132.

The spelling of 70771978 in words is "seventy million, seven hundred seventy-one thousand, nine hundred seventy-eight".