70121772 has 36 divisors (see below), whose sum is σ = 202574736. Its totient is φ = 20034720.

The previous prime is 70121759. The next prime is 70121789. The reversal of 70121772 is 27712107.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138879 + ... + 139382.

It is an arithmetic number, because the mean of its divisors is an integer number (5627076).

Almost surely, 2^70121772 is an apocalyptic number.

It is an amenable number.

70121772 is an abundant number, since it is smaller than the sum of its proper divisors (132452964).

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

70121772 is a wasteful number, since it uses less digits than its factorization.

70121772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278278 (or 278273 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 70121772 is about 8373.8743721171. The cubic root of 70121772 is about 412.3673711352.

Adding to 70121772 its reverse (27712107), we get a palindrome (97833879).

The spelling of 70121772 in words is "seventy million, one hundred twenty-one thousand, seven hundred seventy-two".