70621840 has 20 divisors (see below), whose sum is σ = 164195964. Its totient is φ = 28248704.

The previous prime is 70621807. The next prime is 70621843. The reversal of 70621840 is 4812607.

It can be written as a sum of positive squares in 2 ways, for example, as 37994896 + 32626944 = 6164^2 + 5712^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 70621799 and 70621808.

It is not an unprimeable number, because it can be changed into a prime (70621843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441307 + ... + 441466.

Almost surely, 2^70621840 is an apocalyptic number.

It is an amenable number.

70621840 is an abundant number, since it is smaller than the sum of its proper divisors (93574124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70621840 is a wasteful number, since it uses less digits than its factorization.

70621840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882786 (or 882780 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 70621840 is about 8403.6801462217. The cubic root of 70621840 is about 413.3453054689.

The spelling of 70621840 in words is "seventy million, six hundred twenty-one thousand, eight hundred forty".