70577721 has 6 divisors (see below), whose sum is σ = 101945610. Its totient is φ = 47051808.

The previous prime is 70577713. The next prime is 70577729. The reversal of 70577721 is 12777507.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (70577713) and next prime (70577729).

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 1022121 = 8340^2 + 1011^2 .

It is not a de Polignac number, because 70577721 - 2³ = 70577713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70577729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3920976 + ... + 3920993.

It is an arithmetic number, because the mean of its divisors is an integer number (16990935).

Almost surely, 2^70577721 is an apocalyptic number.

It is an amenable number.

70577721 is a deficient number, since it is larger than the sum of its proper divisors (31367889).

70577721 is a wasteful number, since it uses less digits than its factorization.

70577721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7841975 (or 7841972 counting only the distinct ones).

The product of its (nonzero) digits is 24010, while the sum is 36.

The square root of 70577721 is about 8401.0547552078. The cubic root of 70577721 is about 413.2592122698.

The spelling of 70577721 in words is "seventy million, five hundred seventy-seven thousand, seven hundred twenty-one".