70312500 has 90 divisors (see below), whose sum is σ = 222167946. Its totient is φ = 18750000.

The previous prime is 70312481. The next prime is 70312513. The reversal of 70312500 is 521307.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 18558864 + 51753636 = 4308^2 + 7194^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 14062498 + ... + 14062502.

Almost surely, 2^70312500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70312500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111083973).

70312500 is an abundant number, since it is smaller than the sum of its proper divisors (151855446).

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

70312500 is an frugal number, since it uses more digits than its factorization.

70312500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 70312500 is about 8385.2549156242. The cubic root of 70312500 is about 412.7409061118.

Adding to 70312500 its reverse (521307), we get a palindrome (70833807).

It can be divided in two parts, 703 and 12500, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 70312500 in words is "seventy million, three hundred twelve thousand, five hundred".