70491787 has 2 divisors, whose sum is σ = 70491788. Its totient is φ = 70491786.

The previous prime is 70491781. The next prime is 70491823. The reversal of 70491787 is 78719407.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70491787 - 2²³ = 62103179 is a prime.

It is not a weakly prime, because it can be changed into another prime (70491781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35245893 + 35245894.

It is an arithmetic number, because the mean of its divisors is an integer number (35245894).

Almost surely, 2^70491787 is an apocalyptic number.

70491787 is a deficient number, since it is larger than the sum of its proper divisors (1).

70491787 is an equidigital number, since it uses as much as digits as its factorization.

70491787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 70491787 is about 8395.9387205958. The cubic root of 70491787 is about 413.0914188088.

It can be divided in two parts, 7049 and 1787, that added together give a square (8836 = 94²).

The spelling of 70491787 in words is "seventy million, four hundred ninety-one thousand, seven hundred eighty-seven".