70072551 has 12 divisors (see below), whose sum is σ = 106543320. Its totient is φ = 44256240.

The previous prime is 70072517. The next prime is 70072571. The reversal of 70072551 is 15527007.

It is not a de Polignac number, because 70072551 - 2⁹ = 70072039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70072511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204720 + ... + 205061.

It is an arithmetic number, because the mean of its divisors is an integer number (8878610).

Almost surely, 2^70072551 is an apocalyptic number.

70072551 is a deficient number, since it is larger than the sum of its proper divisors (36470769).

70072551 is a wasteful number, since it uses less digits than its factorization.

70072551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409806 (or 409803 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 70072551 is about 8370.9348940247. The cubic root of 70072551 is about 412.2708633757.

Adding to 70072551 its reverse (15527007), we get a palindrome (85599558).

The spelling of 70072551 in words is "seventy million, seventy-two thousand, five hundred fifty-one".