72870634 has 4 divisors (see below), whose sum is σ = 109305954. Its totient is φ = 36435316.

The previous prime is 72870631. The next prime is 72870641. The reversal of 72870634 is 43607827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 15186609 = 7595^2 + 3897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72870593 and 72870602.

It is not an unprimeable number, because it can be changed into a prime (72870631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18217657 + ... + 18217660.

Almost surely, 2^72870634 is an apocalyptic number.

72870634 is a deficient number, since it is larger than the sum of its proper divisors (36435320).

72870634 is a wasteful number, since it uses less digits than its factorization.

72870634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36435319.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 72870634 is about 8536.4298157954. The cubic root of 72870634 is about 417.6868949411.

The spelling of 72870634 in words is "seventy-two million, eight hundred seventy thousand, six hundred thirty-four".